Written by Sheng-Lin Lin, Risk Engineer, GNS Science
The tsunami survey is a research initiative funded by the New Zealand RiskScape programme (www.riskscape.org.nz) in partnership with the University of Canterbury and theStIRRRD programme.
Yesterday (16/11/18) morning we continued ourdamage survey in the east side of bridge but further north, as shown in thesurvey point distribution.
In the afternoon, we visited Balaroa, one of the
liquefaction areas near Palu.
As shown in the image, the damage/impact is impressive and very sad.
We thought some damage might come from
liquefaction, but the majority of the houses were swallowed/damaged by the
landslide/mudslide as the scale is unbelievable.
I’m on the way back to Wellington, but the team will continue their field survey today (Saturday), and head back Jakarta on Sunday,have debrief meeting on Monday in Jakarta with ITST, and then head back NZ on Monday late afternoon.
Written by Sheng-Lin Lin, Risk Engineer, GNS Science
The tsunami survey is a research initiative funded by the
New Zealand RiskScape programme (www.riskscape.org.nz)
in partnership with the University of Canterbury and the StIRRRD programme.
Summary – 15/11/2018
Yesterday (15/11/2018) morning we continued our damage survey (incl. inundation depth measurement) in the west side of bridge,and we moved to the east side of bridge in the afternoon.
As shown, we have covered the majority of the
waterfront area, we will continue the east side today, and might check other
place this afternoon.
Though it’s an unfortunate event, my observation isthat people are still very positive and keep moving on (exact message from theimage took from a shop near the collapsed bridge)
PS. Felt first aftershock since arriving couple hours ago, a moderate one?!, We weren’t worried too much but it came after power outage, so made things interesting. The power is back so we are fine now, and I can share our survey activities with you…😊
We can only imagine how horrific it currently is for the people of Central Sulawesi, following the magnitude 7.5 earthquake that struck Donggala and Palu on late Friday afternoon 28th Sept 2018. The damaging tsunami which struck Palu Bay at incredible speeds a reported 30mins after the quake happened, caused wide spread destruction. This was on top of significant damage due to the earthquakes north of the city and also along the Palu-Koru Fault. Tsunami waves as high as 5.5m crashed ashore in the already damaged city, destroying buildings, smashing vehicles and killing hundreds of people.
Palu and Donggala are both StIRRRD districts and the StIRRRD team have been working in these areas over the past 7 years. We have many colleagues and friends in the community and we wait anxiously for news of how they are.
The team were last in Palu and Donggala in March 2018, installing seismometers in 3 schools in the area plus one at the university. The seismometers are intended as an educational tool to help the students understand the seismology of the area and to stimulate discussions about earthquakes and tsunami; their causes, hazard mitigation, preparedness and response actions. Students learned the importance of natural warnings for tsunami, and how to Drop, Cover and Hold. We hope these discussions in March were able to help those teachers and students with their actions in this event.
The current death toll has exceeded 840 and is expected to rise sharply over the coming days and weeks, leaving the StIRRRD team deeply concerned for our friends and colleagues who we’ve not been able to contact. In addition to the death toll, an estimated 2.4M people have been affected, with six hundred people hospitalised and 48,000 people displaced. The isolation of affected communities and the scarcity of resources is making response efforts difficult.
The tsunami was bigger than anticipated and the generation mechanism likely more complex than originally thought. The fault that ruptured on Friday was a so-called strike-slip fault, in which the earth movement is largely horizontal. That kind of movement would not ordinarily create a tsunami. However, a strike-slip fault might have some amount of vertical motion that could displace seawater. The fault’s rupture zone, may pass through an area where the seafloor rises or drops off, so that when the fault moves during the quake, it pushes seawater in front of it. Another possibility is that the tsunami was created by an undersea landslide, caused by the intense shaking. Determining the exact cause of the tsunami will have to wait until the sea floor can be examined. The shape of Palu Bay has no doubt contributed to the size of the waves in Palu, with the waves’ energy being focused (amplified) along the hairpin shaped bay.
In the 7 years the StIRRRD team have been working with Palu, and more recently Donggala, the districts have been making steady progress in improving their resilience. The team have been impressed by the dedication of the local government staff working in this field and Tadulako University’s efforts to improve their teaching programmes.
Palu and Donggala have been working towards the implementation of Risk Reduction Action Plans – a set of actions inspired by NZ and Indonesia working and learning together. Since they have been introduced, they have resulted in a number of enhancements: expansion of earth sciences and risk modeling at Tadulako University, a new public education programme, micro-zonation studies in Palu, increased budget for risk reduction, the establishment of a spatial mapping capability in the planning department and a collaborative research and awareness raising programme into the Palu-Koru Fault (http://voinews.id/index.php/component/k2/item/2109-palu-koro-expedition-unveils-the-great-earthquake-potential-in-central-sulawesi ).
Tadulako University was also about to host its first international conference on Urban Disaster Resilience in November 2018: (http://fatek.untad.ac.id/icudr/)
It’s still early days, and building resilience requires a sustained effort over generations. This combined earthquake and tsunami event has been devastating. This has always been possible in this part of the world but it’s not what you ever anticipate will actually happen. This will set Palu and Donggala back, but it has redoubled our resolve to work with our friends and colleagues there to look to the future and ensure risk reduction is built into the recovery process.
During the week 5 to 9 March, StIRRRD team members were based in Palu, Central Sulawesi to launch Indonesia’s first Seismometers in Schools (SIS) programme. Seismometers in Schools is an education initiative already present in Australia, New Zealand and the United States which involves installing seismometers in schools as tools to increase awareness of seismic hazards and risks. Information from the seismometers can be analysed by mathematics, physics or geography students to assess earthquakes recorded locally or from around the world.
As a part of the StIRRRD programme, the pilot SIS programme has been established in Central Sulawesi province with seismometers installed in four schools and a more sophisticated three component device installed at the University of Tadulako, Palu. The participating schools are SMA Negeri Model Terpadu Madani and MAN 1 in Palu City, SMA N 1 Banawa in Donggala and SMA N 1 Bahadopi in Morowali. Only public schools were selected to be involved in the pilot study. All installations were undertaken in the first week of March, except for Morowali which will be installed in the coming weeks.
On Monday 5 March, StIRRRD team members visited all schools, in Palu and Donggala, to begin installing the equipment and meeting the school principals and teachers. The team were warmly welcomed to all schools with teachers expressing gratitude and excitement that their schools were chosen to be a part of the project. In the following days, installation of the equipment would be completed in each school and training workshops for teachers to increase their knowledge of earthquake and tsunami risks were undertaken.
Importantly, the project has been supported by a range of Indonesian agencies willing to assist the schools with technical support and further training. Their commitment was recognised in a MoU signing ceremony on 5 March. The agencies signing the MoU include:
Palu’s local university – Universitas of Tadulako (UNTAD)
The provincial office of the national seismic monitoring agency – Kantor Stasiun Geofisika Palu (BMKG)
The local emergency management offices – BPBD Kota Palu & BPBD Kabupaten Donggala
The provincial office of the national education office – Dinas Pendidikan Provinsi Sulawesi Tengah
The provincial office of the national Ministry of Religion – Kakanwil Kemenag Provinai Sulawesi Tengah
All agencies were very enthusiastic about the SIS programme and agreed to help with technical assistance, further capacity building for teachers, help with assessing earthquake traces and providing ideas on how students might develop future projects. This enthusiasm was further reflected by the extensive media coverage the project received during the week in Palu, some which can be found here:
On Tuesday 6 March, the StIRRRD team visited SMA Negeri Model Terpadu Madani where an initial ceremony was followed by an overview of local seismic hazards and risks and capacity building for teachers and a group of selected students. This session was largely delivered by Universistas Gadjah Mada (UGM), StIRRRD team members and a representative from LIPI – Indonesia’s Institute of Science. Teachers and students were highly engaged during the session, while enjoying New Zealand chocolate for answering questions correctly, which was followed by a visit to the recently installed seismometer. In the afternoon, members of the StIRRRD team led targeted training session for the teachers with input from the agencies noted above. A demonstration of how the seismometer works by a technician from GNS Science was well received and ideas for future student projects was discussed with teachers.
The same programme was delivered to MAN 1 in Palu City and SMA N 1 Banawa in Donggala on 7 and 8 March respectively. A highlight was returning to Donggala on Thursday and discovering that their seismometer had already detected its first earthquake the night before! The last seismometer to be installed in SMA N 1 Bahadopi school in Morowali will happen in coming weeks by UGM staff and technicians assisted by BMKG.
All of the seismometers are now part of the global raspberry shake seismic network with real time data from each of the devices available here: http://raspberyshake.net/stationview
On Friday 9 March, the team completed the installation of a more sophisticated three-component seismometer at the Universitas of Tadulako (UNTAD). This device will support future research projects on the seismicity of the area and provide further data for the local Palu-Koro Fault seismic network managed by BMKG.
That morning, StIRRRD team members met with the Dean of the Engineering and faculty staff to sign an MoU between UGM and UNTAD in support of the Seismometers in Schools programme in Central Sulawesi. There was much discussion on the disaster management international conference that UNTAD will host in November. The conference will coincide with the final evaluation of the SIS pilot project and StIRRRD team will have a very active presence at this event, including having a key note speaker.
Overall, there was a lot of excitement about the new seismometers and opportunities to increase the capacity of teachers and knowledge of the high seismic risk present in Palu and Donggala. This interest was reflected with high engagement across social media (Twitter) with the national emergency management ministry (BNPB), the New Zealand embassy in Jakarta and the Universitas of Tadulako regularly liking and retweeting @StIRRRD tweets throughout the pilot deployment. Globally, organisations such as the Raspberry Shake Seismometer network (based in Panama), Australian SIS project, the IRIS earthquake programme (based in Washington) and the British Geological Survey seismology project were also very engaged by commenting, liking and retweeting our posts all week!
StIRRRD team members and representatives from across StIRRRD districts attended the national DRR month event held in Sorong, West Papua on Monday 23 and Tuesday 24 October. The Monday morning consisted of an opening ceremony and speeches by dignitaries including an update on the BNPB forward work programme from Willem Rampangilei, Head of BNPB.
During the afternoon, StIRRRD hosted a special session on DRR and international cooperation. Chaired by StIRRRD UGM team members, two sessions were held with a focus on cooperation at the national level and international assistance with DRR implementation in the districts. Presenters at the respective sessions included:
Sumedi Andono Mulyo, Director of Disadvantaged Areas, Transmigration and Rural Areas, BAPPENAS
Richard Woods, Natural Hazards Risk Management Specialist, GNS Science
Lilik Kurniawan, Director Disaster Risk Reduction, BNPB
Presentations from Pak Lilik (BNPB) and Pak Sumedi (BAPPENAS) discussed their respective DRR work programmes. Of note, Pak Sumedi discussed the strong alignment between the StIRRRD programme and BAPPENAS work programme over the next few years. In addition, he highlighted the potential for future collaboration on modelling the economic impact of disasters for cost-benefit analyses using existing New Zealand economic models.
Akris Mohamad Yunus Fattah, Head of BPBD, Donggala
Selupati SH, Head of BPBD, Bengkulu
Drs Zainal Abidin, Head of BPBD, Sumbawa
Henry, BPBD Head of Prevention and Preparedness, Padang
The presentations from BPBD in Donggala, Bengkulu, Sumbawa and Padang provided insights into the strengths and challenges that each district has faced during action plan implementation.On the morning of 24 October, StIRRRD director Teuku Faisal Fathani presented on lessons and good practice from the implementation of early warning systems to detect land movement. Pak Faisal presented alongside the Chairman of Mat Peci, Usman Firdaus and Medi Herlianto, BNPB Director of Readiness.
At 10:08 am on Sunday 13 August, a magnitude 6.4 earthquake occurred off the coast of Sumatra, about 75km to the west of Kota Bengkulu (Figure 1). The earthquake occurred at a depth of around 35 km, and resulted in strong shaking in the Bengkulu and Seluma districts. The earthquake was felt as far away as Padang and South Sumatra but did not generate any tsunamis.
In North Bengkulu (the area closest to the quake) strong shaking was felt for about 10 seconds, causing some panic amongst locals. The most common response was to quickly move outdoors. Some minimal damage to buildings was observed, but there were no reports of casualties. The earthquake resulted in power outages in some parts of the district.
Bengkulu BPBD activated in response to the event, with staff undertaking field checks, and reporting for duty if a wider response was required. They were stood down later in the day.
There is significant seismic risk for many communities on the island of Sumatra, and the districts involved in the StIRRRD program have included a number of activities in their DRR Action Plans to better understand and reduce this risk. StIRRRD alumni are also working on a range of other seismic risk reduction activities. For example, at the University of Bengkulu, Dr. M. Farid is working to understand and map liquefaction hazard; and Universitas Andalas (Padang) staff are trialing a method to retrofit un-reinforced brick buildings with wire mesh, to improve their ability to withstand seismic shaking.
A recent GNS Science project involved a small team of Maori community leaders visiting the Agam Regency in West Sumatra, Indonesia.
The purpose of the journey was to exchange cultural knowledge and experience of natural disasters between representatives of Maori and the local Minangkabau people of Agam . Maori participants included Tui Warmenhoven and Jean Palmer of Ngāti Porou and Robyn Rauna, Ngāi Tāmanuhiri all from the Gisborne District, and Joe McLeod of Te Pringa O Te Awaikairangi in Lower Hutt. Accompanying the visitors were Phil Glassey and Julian Thomson from GNS Science, Dr Megan Collins, a musicologist who has extensive knowledge of the local Minangkabau culture indigenous to Agam, along with Drs Esti Anantsari and Arry Retnowanti from University of Gadja Mada (UGM).
After a traditional ceremonial greeting by the Regent, the first location of our visit was the Tiku community on the Agam coast. The people here depend largely on fishing for their livelihoods. They are also subject to a serious tsunami hazard as the coastline faces a major plate boundary fault.
We were introduced to a group of local women who had taken steps towards self-empowerment and community resilience through micro businesses related to fishing. This had different aspects, including economic, educational and disaster planning elements.
The women showed us how they had developed dried seafood products, which they sell under the label, ‘Beautiful Coral’, that can be stored long term which added value to the fish that were caught by the men in the community.
This local lady lived nearby. Although her husband died some years ago, as a couple, they had purchased land together, which she has now been able to develop with the assistance of Jemari Sakato, a local NGO supported by Oxfam. They gave her some chickens and a couple of goats. Over time she has expanded her livestock and, along with selling coconuts and caring for the neighbours cows, she has become financially independent. She is able to afford micro-insurance that protects her livelihood in case of a natural disaster.
There were many cultural treats for our group during our visit. Here is a performance of the Shi’a Islamic music called Tambuah Tasa (bass and snare drum ensemble), from Bukik Malintang, with dancers from the randai theatre group ‘Santan Batapih’. The drumming performance was incredibly powerful.
Next we headed inland and stopped at a village that had been designed and built in a Sumatran jungle clearing to house people who had been impacted by a large earthquake in 2009. There were roughly 120 identical houses, along with a mosque and community centre. The village is more or less ready, but yet to be occupied.
We then travelled on to Lake Maninjau. This is a dormant volcanic crater (caldera).
The people living on its shores rely on fishing also. The photo shows the nets used for intensive fish farming.
Because the sides of the crater are so steep, they are subject to many landslides that endanger the locals. This is one that we drove across and must have been very recent. The road had not yet been properly repaired.
These signs indicate evacuation routes down to the lake shore in case of an emergency.
From the lake we made our way to to Canduang and a traditional house called a Rumah Gadang, where we had been invited to stay the night. The traditional architecture of the roof is typical of the Padang area. The points represent buffalo horns from a legend in which a buffalo saved the local minangkabau people from invasion by the Javanese.
In Canduang we were again welcomed with by the Pasambahan dance, which this time included silek martial arts, demonstrated by senior masters. The two men were sparring with knives.
We shared a community meal inside the big house, which belongs to Mrs Zulharty and her extended family.
Afterwards, the team where treated to a performance of Saluang jo Dendang (flute and voices). Megan Collins also gave a performance on the rabab Pasisia Selatan (fiddle from the South Coast) singing the opening of a kaba narrative that was much appreciated by the local audience.
The Rumah Gadang is a meeting space with several bedrooms at the back. Communities in this area are based on small extended family units that live in each Rumah Gadang, and the family structure is matrilineal. Women have the main authority in the family and the oldest woman in the family owns the house. Her daughters each have a bedroom allocated and when they marry, their husband moves in to the house with them.
Here Jean and Robyn sit with the matriarch of the household , who is highly respected and is 92 years old.
Our next visit was up on to the slopes of Mount Marapi, a volcano that actively threatens surrounding settlements. In this photo it is seen from the town of Bukittinggi.
We were welcomed to Lassi village, on Mount Merapi, by the local disaster management group ‘Marapi Alert’ who demonstrated their katentong bamboo ‘clappers’. These make a very loud drumming noise when the handle is pushed back and forth, and are used as an alarm system to relay warnings of volcanic activity from village to village. Cellphones are also used.
Edi is the local co-ordinator for disaster risk reduction (DRR) activities in Lassi village. Here he explains the local volcanic hazards and about some of the projects that are used to develop local resilience and safety.
A powerful display of traditional martial arts from two teenage girls accompanied by boys playing the Tambuah Tasa drums at Sungai Pua, Mount Merapi.
Mr Datuak Mangkato Saripadois a master craftsman of the West Sumatran talempong gongs. His family has been making these classical instruments for nine generations. exports them all over Indonesia and Malaysia.
Mount Singgalang is the second large volcano that looms over Bukittinggi.
On our final day we visited Institute Seni Indonesia (ISI) Padang Panjang, a Tertiary Arts Institute. We learnt how performers of local music include stories of natural disasters that give information about the particular impacts they had on the lives of people. These stories are even woven into modern pop music and include recent events such as the damaging Padang earthquake of 2009 and flash floods in Kambang in 2011. Tui Warmenhoven and Jean Palmer give a talk on how knowledge of natural disasters in embedded in Maori traditional stories of the creation of Aotearoa.
Mrs Susasrita Loravianti, Mr Rafiloza from ISI and Megan Collins gave talks about West Sumatran music and dance, indigenous knowledge and disasters.
In this photo L to R: Tui Warmenhoven, Jean Palmer, Robyn Rauna and Joe McLeod
Held on 16 February, Morowali’s Action Plan workshop received positive feedback from local stakeholders and parliamentarians. Having experienced frequent flooding and coastal abrasion issues in recent years, local authorities have been concentrating reduction efforts on mitigating the impacts of these natural hazards, largely through physical works.
Morowali’s Vulnerability Profile
Working through Morowali’s vulnerability profile showed that while flooding and coastal abrasion are frequent occurrences, the threat of large earthquakes affecting the district is very high. Due to the presence of active faulting across Central Sulawesi and the specific location of some faults (see image), Morowali ranks in the top 40 out of 500 districts prone to earthquake activity across Indonesia.
Earthquakes: So what’s the risk Morowali?
In his presentation to workshop participants, Professor Iman Satyarno from UGM University, described the prevalence of the Matano Fault in central Morowali (see image). On 16 April 2012, a magnitude 5.8 earthquake occurred, located on or nearby this fault. The earthquake heavily damaged houses in two communities while also damaging Morowali’s government buildings. Two years later another earthquake occurred further to the east, causing less damage but still being felt across central Morowali. This recurrent activity is a reminder of the prevalent earthquake risk across the district.
Earthquakes: What are the DRR options?
While large earthquakes are relatively infrequent in Morowali, compared to other natural hazards, their impact may be substantially larger than the combined impact of smaller events. This concept has been recognised by members of local government, the emergency management agency (BPBD) and other key stakeholders attending the workshop.
These members of the community are now considering many initiatives to reduce the risk from future earthquakes. Such initiatives include methods to strengthen existing buildings, socialisation of information on building earthquake resistant structures, microzonation of land in close proximity to active faults and regulations for future development and construction.
A Quick Win for Morowali and StIRRRD
Having a wide representation of stakeholders to consider disaster risk reduction initiatives is key to ensuring efforts are coordinated. On 17 February, the StIRRRD team visited the local parliament to raise awareness of the project’s focus on Morowali District and seek support for the community’s action plan going forward.
During this meeting, local parliamentarians (DPRD) raised concerns regarding Morowali’s earthquake risk, particularly in regard to the Matano Fault, which had only been located in the district after boundary changes in recent years. DPRD representatives attending the previous day’s workshops were able to convey the district’s vulnerability profile to decision makers within a matter of hours. As a result, Morowali is now considering implementing earthquake resistant regulations and micro-zonation of properties in close proximity to the Matano Fault.
A great result for Morowali District and StIRRRD team from their short visit! The StIRRRD team will return to Morowali later in 2016 to provide feedback on the district’s risk reduction action plan.
The StIRRRD team were back in Donggala this week on our third visit, supporting the local disaster management agency in its final stages of developing an action plan aimed at reducing risk. Many stakeholders joined the discussion and there will be follow-up workshops to fine-tune the details next week.
The plan is an attempt to coordinate risk reduction activities across different local government work units: development planning, public works, health, disaster management, education, agriculture, environmental management, etc. It also involves and is supported by the local university, Tadulako University, and NGOs.
Workshop participants listen to Dr Agung Setianto from Gadjah Mada University.
The plan was presented to Donggala’s parliament which generally supported the workplan. We hope that greater priority will be given to DRR and a greater budget allocated as a result. A robust debate was had about the role deforestation and aggregate mining were having on increasing risk, particularly increasing the frequency of landslides, flooding and coastal erosion. It was great to see the awareness of these issues and local government debating ways of managing these problems. The proof will be in changes over time, one step at a time.
Presenting the Action Plan to Donggala Parliament.
The team also took the opportunity to meet with colleagues from Tadulako University, who are an important stakeholder and who will help local government tackle the DRR challenges in the district. Tadulako are taking initiatives to develop capability in risk modelling and are involving students in capturing building asset data in Palu on tablets in order to better understand the vulnerability of different types of buildings to natural hazards. See an earlier blog on Riskscape training.