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Coseismic and postseismic deformation from the 2007 Bengkulu earthquake based on GPS Data Irwan Meilano; Susilo Susilo; Endra Gunawan; Suchi Rahmadani
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 31, No 2 (2021)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/risetgeotam2021.v31.1182

On September 12, 2007, a M8.5 megathrust earthquake occurred along the Sunda trench near Bengkulu, West Sumatra. GPS data in Sumatra have indicated the coseismic and postseismic deformations resulting from this earthquake. Our estimate of coseismic displacements suggests that the earthquake displaced up to ~1.8m at GPS stations located north of the epicenter. Moreover, our principal strain estimation in the region suggests that the maximum coseismic extensional strain is ~40 ppm. Our analysis of GPS data in the region suggests that the postseismic decay of the 2007 Bengkulu earthquake was 46 days, estimated using a logarithmic function.

Interseismic Slip Distribution Analysis in East Java Bagoes Dwi Ramdhani; Irwan Meilano; Endra Gunawan
Indonesian Journal of Geospatial Vol 7 No 1 (2018)
Publisher : Indonesian Journal of Geospatial

Show Abstract | Download Original | Original Source | Check in Google Scholar

We reexamined GPS stations in Eastern part of java to understand the recent deformation from the convergence zone between the Australian Plate and Sunda Block in East Java. From the seismic record in the subduction zone shown the occurrence of tsunami earthquake in M7.7 in 1994 and several number of earthquakes that potentially become tsunami. To comprehensively obtain the signal in subduction zone, we have to remove the effect of the other major sources deformation in the area of study, as in this study is the block motion from Sunda Block. To remove the block motion of Sunda Block we used the parameters of the model Altamimi (2007) in the GPS field. The used data for this research is several campaign GPS and Continuously GPS data from 2010 "“ 2016. These data processed using GAMIT/GLOBK 10.6 software to obtain geocentric coordinates, geodetic coordinates, and standard deviation which reference to ITRF2000. Geocentric coordinates are transformed into topocentric coordinates to know the rate of shift vector speed. From the obtained displacement rate, carried reduction to clean up from other deformation source. The value of surface deformation is made as input for the inversion calculation from dislocation theory in half space by Okada (1992). The result show the strong slip distribution in the two sides of fault model that located near the costal of Pacitan and the in the south of Banyuwangi, this slip distribution represent the coupling from the convergence zone. It indicates there are accumulating energy due to convergence of the megathrust. The comparison of surface deforomation from forward calculation and the GPS observation are nearly similar which indicated by the value of rms residual is ± 2.06 mm. However from the model accuracy and resolution found that model contain misfit in dependent location. From this research, we highlight the value of slip distribution correlating to the risk assessment in Java Island.

GEODETIC SLIP RATE ESTIMATES FOR THE KUMERING AND SEMANGKO SEGMENTS OF THE SUMATERA FAULT Irwan Meilano; Susilo Susilo; Endra Gunawan; Budi Parjanto
Jurnal Meteorologi dan Geofisika Vol 22, No 1 (2021)
Publisher : Pusat Penelitian dan Pengembangan BMKG

The Sumatran fault is a right lateral active inland fault in southern Sumatra, Indonesia. Although historical earthquake records have shown that magnitude 7 class earthquakes have occurred during the last century, the slip rates along the Sumatran fault have not been studied in detail. This is the first research using a new dense GPS array, in which stations are orthogonal to the fault, to analyze the fault slip rates along the Kumering and Semangko segments in southern Sumatra. In this study, we process GPS data from 14 campaign and continuous GPS points. The results show velocities of 14 mm/yr and 15 mm/yr for these two fault segments, respectively. Our estimated geodetic slip rate suggests that the Sumatran fault has a relatively homogeneous slip rate from southern to northern Sumatra.

Pemodelan Bahaya Tsunami dan Evaluasi Strategi Evakuasi di Tanjung Benoa Bali untuk mendukung upaya Safe-Tourism Bali Kembali Nuraini Rahma Hanifa; Nurul Sri Rahatiningtyas; Iman Fatchurochman; Endra Gunawan; Dwi Hartanto; Ida Bagus Oka Agastya; I Nyoman Putera Indrawan; Giovanni Cynthia Pradipta; Tomy Gunawan; Yogha Mahardikha Putra
Jurnal Meteorologi dan Geofisika Vol 23, No 1 (2022)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Salah satu upaya untuk mendorong Bali Kembali dalam era normal baru pasca pandemi Covid-19 yaitu menekan disrupsi dari bencana, diantaranya ancaman gempa dan tsunami. Penelitian ini bertujuan untuk memutakhirkan pemodelan bahaya tsunami, mengevaluasi tempat dan jalur evakuasi, menggali sejauh mana masyarakat dan wisatawan memahami informasi peringatan tsunami dari BMKG dan BNPB, dan perintah evakuasi dari BPBD. Melalui penelitian ini diharapkan dapat memberikan manfaat bagi sektor kesehatan, pariwisata, ekonomi dan sosial budaya secara langsung kepada masyarakat di Provinsi Bali. Penelitian ini meliputi delapan tahap yaitu, 1) identifikasi sumber dan bahaya gempa pemicu tsunami; 2) identifikasi parameter sumber gempa; 3) pemodelan tsunami; 4) survei lapangan; 5) analisis data eksposur; 6) network analysis closest facility, 7) gap analysis, dan 8) analisis pemahaman masyarakat terhadap tsunami dan evakuasi mandiri. Hasil dari penelitian ini menunjukkan bahwa seluruh area Tanjung Benoa memiliki potensi terdampak tsunami. Estimasi tinggi tsunami di sisi Timur berkisar 10-14 m , estimasi tinggi tsunami di sisi Barat berkisar 3-6 m dan estimasi waktu tiba tsunami berkisar 20-25 menit. Hasil penelitian ini mengindikasikan bahwa perlu mempertimbangkan untuk amendemen Peraturan Gubernur, terkait estimasi waktu kedatangan tsunami, yang tertulis 30 menit. Saat ini terdapat 8 hotel terdistribusi di sepanjang pantai sisi timur sebagai tempat evakuasi. Namun hanya dapat menampung setengah penduduk, di luar jumlah wisatawan. Sehingga perlu penambahan tempat evakuasi di wilayah Tanjung Benoa, dengan tinggi minimal 20 meter. Mengingat peraturan batas tinggi bangunan di wilayah Bali, maka direkomendasikan adanya pengecualian untuk kasus ini, dan bisa dipertimbangkan adanya Pura di bagian atas dari tempat evakuasi.

GEODETIC SLIP RATE ESTIMATES FOR THE KUMERING AND SEMANGKO SEGMENTS OF THE SUMATERA FAULT Irwan Meilano; Susilo Susilo; Endra Gunawan; Budi Parjanto
Jurnal Meteorologi dan Geofisika Vol. 22 No. 1 (2021)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v22i1.802

The Sumatran fault is a right lateral active inland fault in southern Sumatra, Indonesia. Although historical earthquake records have shown that magnitude 7 class earthquakes have occurred during the last century, the slip rates along the Sumatran fault have not been studied in detail. This is the first research using a new dense GPS array, in which stations are orthogonal to the fault, to analyze the fault slip rates along the Kumering and Semangko segments in southern Sumatra. In this study, we process GPS data from 14 campaign and continuous GPS points. The results show velocities of 14 mm/yr and 15 mm/yr for these two fault segments, respectively. Our estimated geodetic slip rate suggests that the Sumatran fault has a relatively homogeneous slip rate from southern to northern Sumatra.

Pemodelan Bahaya Tsunami dan Evaluasi Strategi Evakuasi di Tanjung Benoa Bali untuk mendukung upaya Safe-Tourism Bali Kembali Nuraini Rahma Hanifa; Nurul Sri Rahatiningtyas; Iman Fatchurochman; Endra Gunawan; Dwi Hartanto; Ida Bagus Oka Agastya; I Nyoman Putera Indrawan; Giovanni Cynthia Pradipta; Tomy Gunawan; Yogha Mahardikha Putra
Jurnal Meteorologi dan Geofisika Vol. 23 No. 1 (2022)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v23i1.837

Salah satu upaya untuk mendorong Bali Kembali dalam era normal baru pasca pandemi Covid-19 yaitu menekan disrupsi dari bencana, diantaranya ancaman gempa dan tsunami. Penelitian ini bertujuan untuk memutakhirkan pemodelan bahaya tsunami, mengevaluasi tempat dan jalur evakuasi, menggali sejauh mana masyarakat dan wisatawan memahami informasi peringatan tsunami dari BMKG dan BNPB, dan perintah evakuasi dari BPBD. Melalui penelitian ini diharapkan dapat memberikan manfaat bagi sektor kesehatan, pariwisata, ekonomi dan sosial budaya secara langsung kepada masyarakat di Provinsi Bali. Penelitian ini meliputi delapan tahap yaitu, 1) identifikasi sumber dan bahaya gempa pemicu tsunami; 2) identifikasi parameter sumber gempa; 3) pemodelan tsunami; 4) survei lapangan; 5) analisis data eksposur; 6) network analysis closest facility, 7) gap analysis, dan 8) analisis pemahaman masyarakat terhadap tsunami dan evakuasi mandiri. Hasil dari penelitian ini menunjukkan bahwa seluruh area Tanjung Benoa memiliki potensi terdampak tsunami. Estimasi tinggi tsunami di sisi Timur berkisar 10-14 m , estimasi tinggi tsunami di sisi Barat berkisar 3-6 m dan estimasi waktu tiba tsunami berkisar 20-25 menit. Hasil penelitian ini mengindikasikan bahwa perlu mempertimbangkan untuk amendemen Peraturan Gubernur, terkait estimasi waktu kedatangan tsunami, yang tertulis 30 menit. Saat ini terdapat 8 hotel terdistribusi di sepanjang pantai sisi timur sebagai tempat evakuasi. Namun hanya dapat menampung setengah penduduk, di luar jumlah wisatawan. Sehingga perlu penambahan tempat evakuasi di wilayah Tanjung Benoa, dengan tinggi minimal 20 meter. Mengingat peraturan batas tinggi bangunan di wilayah Bali, maka direkomendasikan adanya pengecualian untuk kasus ini, dan bisa dipertimbangkan adanya Pura di bagian atas dari tempat evakuasi.

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