Earthquake relocation in Mollucas Sea using teleseismic double difference method for tectonic setting analysis

Setiadi, Tio Azhar Prakoso; Rohadi, Supriyanto; Heryandoko, Nova

doi:10.1063/1.4987049

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…The other interesting question also comes from the far end of east Flores island, one village reported being lost due to being swept by the giant wave. This phenomenon was long discussed due to the anomalous 25 m run-up which struck the coastal zone of Riangkroko village [19,20].…”

Section: Resultsmentioning

confidence: 99%

Overview of 1990s deadly tsunamis in Indonesia

Julius

Daryono

2021

E3S Web Conf.

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In the 1990s there were 7 (seven) deadly tsunami events due to earthquakes in Indonesia. There is M 7.8 North-east of Flores island sea earthquake (1992), M 7.6 South of Java island sea earthquake (1994), M 6.8 South of Timor Island sea earthquake (1995), M 7.8 North-west of Sulawesi island sea earthquake (1996), M 7.9 East of Biak island sea earthquake (1996), M 7.7 Taliabu island sea earthquake (1998), and M 7.4 East of Banggai Island sea earthquake (2000). Those earthquake and tsunami disasters events affected the number of casualties and damaged houses in coastal areas. Surely those events present a few lessons learned for future disaster preparedness in Indonesia.

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Section: Resultsmentioning

confidence: 99%

Overview of 1990s deadly tsunamis in Indonesia

Julius

Daryono

2021

E3S Web Conf.

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Preface of destructive m<5 earthquakes in Java island, 2015-2019

Julius

Daryono

Widana

2021

IOP Conf. Ser.: Earth Environ. Sci.

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This study aims to denote the possible casualties and damages due to the M<5 earthquake. We used the desk study of literatures to explore earthquake disaster reports. The published significant and destructive earthquakes catalogue by BMKG Indonesia along 2015-2019 noted that six events out of them in Java island due to by below magnitude 5 (M<5) earthquakes. Those are sourced in the land and shallow depth focus on the active faults region. Those earthquakes also cause human losses, that is three events out of them induce casualties, and kill two (2) people. Preliminary analysis concludes that the short distance to earthquake source and local site condition was responsible for this unexpected building damages. We suggest this events to be the lesson learned for disaster risk managers to consider the low magnitude earthquake also able to generate the high hazard on the certain seismic prone areas.

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Preliminary Results: Probabilistic Non-Linear Method to Determine the Hypocenter Location in the Molucca Sea Collision Zone from BMKG Networks

Rachman

Santosa

Rohadi

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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Molucca Sea collision zone is a region which has very complex geology and tectonic setting, producing high seismicity and volcanoes activities. In this study, we have determined hypocenter location around the region using local & regional network of Agency of Meteorology, Climatology, and Geophysics, Indonesia (BMKG). We used 1,647 events that recorded by 32 seismic stations. We repicked the P-and S-phase manually and have been succesfully determined ~17,628 P and ~17,628 S arrival times. The P- and S-arrival times are used to determine the hypocenter location by applying NonLinLoc method which estimating the probability density function (PDF) using the oct-tree importance sampling algorithm. Our preliminary results show that the seismicity beneath the Molucca Sea collision zone forming a double subduction pattern which is dipping westward under the Sangihe Arc, reaching a depth of ~ 600 km and eastward under the Halmahera Arc, reaching a depth of ~ 250 km. The seismicity pattern under the Sangihe Arc deepens to the north and the deep earthquake events increase in number. The seismicity is related to the Molucca Sea Plate which is dipping into west and east direction beneath Sangihe-Halmahera Arc. To have a further understanding of the complex tectonic activity in this area, our future work will focus on conducting a seismic tomographic inversion to determine the 3D seismic velocities structure around the Molucca Sea collision zone.

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Earthquake relocation in Mollucas Sea using teleseismic double difference method for tectonic setting analysis

Cited by 3 publications

References 6 publications

Overview of 1990s deadly tsunamis in Indonesia

Overview of 1990s deadly tsunamis in Indonesia

Preface of destructive m<5 earthquakes in Java island, 2015-2019

Preliminary Results: Probabilistic Non-Linear Method to Determine the Hypocenter Location in the Molucca Sea Collision Zone from BMKG Networks

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