Tsunami hazards in the Molucca Sea, Indonesia: 14 November 2019 Mw7.1 earthquake and tsunami
Abstract
A combination of curved subduction zones along with submarine and land faults has transformed East Indonesia into a most seismically-active area of the world. The tsunami hazard of this region is not well understood although the region has experienced a number of large and deadly tsunamis. Few tsunami researches have been conducted for east Indonesia in comparison to west; thus, it is essential that more researches to be conducted on tsunami hazards of this region to improve tsunami awareness and resilience. Here, the earthquake (Mw 7.1) and tsunami of 14 November 2019 in the Molucca Sea is investigated. We obtained teleseismic waveforms of the earthquake and the tide gauge records of the tsunami and performed seismicity analysis to shed light on the magnitude and mechanisms of earthquakes in the area. Tsunami waveform analysis showed that the maximum zero-to-crest amplitude of the November 2019 event was 13.6 cm. The source model of the earthquake is extracted using teleseismic inversions and was validated by both teleseismic and tsunami observations. The best source model has a slip of up to 3 m and a source length of approximately 50 km. This model ruptures along a high-angle splay fault. Tsunami simulations were conducted using our source model, which showed fairly good agreement with observed tide gauge data.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMNH0140021H
- Keywords:
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- 4315 Monitoring;
- forecasting;
- prediction;
- NATURAL HAZARDS;
- 4333 Disaster risk analysis and assessment;
- NATURAL HAZARDS;
- 4341 Early warning systems;
- NATURAL HAZARDS;
- 4564 Tsunamis and storm surges;
- OCEANOGRAPHY: PHYSICAL