Earthquake Generation Analysis Using the Focal Mechanism Method in the Flores Sea Region, East Nusa Tenggara

DOI

10.2991/978-94-6463-520-1_6How to use a DOI?

Keywords

Earthquake Flores Sea; Focal Mechanism; Indo-Australian Plate; Kalatoa Fault

Abstract

East Nusa Tenggara is an area that has a fairly high seismicity level because it has 2 earthquake hazard zones. The first is the hazard from the subduction zone of the Eurasian Plate and the Indo-Australian Plate, the second is the hazard caused by the back arc thrust fault or also known as the Flores Thrust. This study aims to map the distribution of seismicity and the distribution of focal spheres to determine the characteristics of the fault. The method used is focal mechanism with earthquake data obtained from USGS and Global CMT fault parameters for the period 2017 - 2022. The results obtained show that the study area has an increasing level of seismicity from year to year. A total of 432 earthquakes were recorded, ranging from shallow to deep earthquakes during the last 6 years. In addition, the distribution of focal mechanisms spread across 38 points indicates that earthquake occurrences are dominated by strike-slip fault, although there are also those caused by reverse fault and normal faults. These faults are inseparable from the active geological structures in the Flores Sea region, namely the Kalatoa Fault, the Flores Thrust, and the Indo-Australian Plate subducting beneath the Australian Plate. This indicates that the study area has a very high level of earthquake vulnerability.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Afriansyah Afriansyah
AU  - Sandra Sandra
AU  - Wa Ode Awaliah
AU  - M. H. Rusydi
AU  - Rustan Efendi
AU  - Mauludin Kurniawan
PY  - 2024
DA  - 2024/12/05
TI  - Earthquake Generation Analysis Using the Focal Mechanism Method in the Flores Sea Region, East Nusa Tenggara
BT  - Proceedings of the 5th International Seminar on Science and Technology (ISST 2023)
PB  - Atlantis Press
SP  - 31
EP  - 36
SN  - 2352-541X
UR  - https://doi.org/10.2991/978-94-6463-520-1_6
DO  - 10.2991/978-94-6463-520-1_6
ID  - Afriansyah2024
ER  -