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Abstract
A destructive shallow earthquake with a magnitude of 5.6 struck Cianjur, West Java, Indonesia on November 21, 2022. This earthquake resulted in 602 casualties and the collapse of over 67,504 residences. The day after the mainshock, we deployed 19 temporary seismic stations to monitor aftershocks for a period of 30 days. We manually picked arrival times for 4499 P-waves and 3419 S-waves and determined locations for 514 events. Following the velocity model update, phase refinement through waveform cross correlation, and relocation using double-difference methods, we were able to determine 442 well-defined hypocenters of the aftershocks. We identified two clusters of aftershocks: one in the NNW-SSE direction, with a length of about 8 km, and another in the WSW-ENE direction, with a length of around 6 km. The seismogenic zone of these clusters ranges from a depth of 3 to 13 km. Our interpretation suggests that these clusters may indicate a conjugate fault. It is possible that the mainshock (Mw5.6) Cianjur earthquake on November 21, 2022 occurred on the WSW-ENE direction with sinistral movement.
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Details
1 Institut Teknologi Bandung, Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung, Indonesia (GRID:grid.434933.a) (ISNI:0000 0004 1808 0563); Institut Teknologi Bandung, Research Center for Disaster Mitigation, Bandung, Indonesia (GRID:grid.434933.a) (ISNI:0000 0004 1808 0563)
2 Indonesian Meteorological Climatological and Geophysical Agency, Jakarta, Indonesia (GRID:grid.493867.7) (ISNI:0000 0004 6006 5500); Institut Teknologi Bandung, Geophysical Engineering Study Program, Faculty of Mining and Petroleum Engineering, Bandung, Indonesia (GRID:grid.434933.a) (ISNI:0000 0004 1808 0563)
3 Institut Teknologi Bandung, Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung, Indonesia (GRID:grid.434933.a) (ISNI:0000 0004 1808 0563); Institut Teknologi Bandung, Geophysical Engineering Study Program, Faculty of Mining and Petroleum Engineering, Bandung, Indonesia (GRID:grid.434933.a) (ISNI:0000 0004 1808 0563)
4 National Research and Innovation Agency (BRIN), Research Center for Geological Disaster, Bandung, Indonesia (GRID:grid.434933.a)
5 Indonesian Meteorological Climatological and Geophysical Agency, Jakarta, Indonesia (GRID:grid.493867.7) (ISNI:0000 0004 6006 5500)
6 Institut Teknologi Bandung, Earth Science Study Program, Faculty of Earth Science and Technology, Bandung, Indonesia (GRID:grid.434933.a) (ISNI:0000 0004 1808 0563)
7 Institut Teknologi Bandung, Research Center for Disaster Mitigation, Bandung, Indonesia (GRID:grid.434933.a) (ISNI:0000 0004 1808 0563); National Research and Innovation Agency (BRIN), Research Center for Geological Disaster, Bandung, Indonesia (GRID:grid.434933.a)
8 Insitut Teknologi Sepuluh Nopember, Geophysical Engineering Department, Surabaya, Indonesia (GRID:grid.444380.f) (ISNI:0000 0004 1763 8721); ETH Zürich, Swiss Seismological Service (SED), Zürich, Switzerland (GRID:grid.5801.c) (ISNI:0000 0001 2156 2780)
9 Institut Teknologi Bandung, Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung, Indonesia (GRID:grid.434933.a) (ISNI:0000 0004 1808 0563); The Australian National University, Research School of Earth Sciences, Canberra, Australia (GRID:grid.1001.0) (ISNI:0000 0001 2180 7477)
10 Indonesian Meteorological Climatological and Geophysical Agency, Jakarta, Indonesia (GRID:grid.493867.7) (ISNI:0000 0004 6006 5500); University of Cambridge, Department of Earth Sciences – Bullard Labs, Cambridge, UK (GRID:grid.5335.0) (ISNI:0000 0001 2188 5934)
11 Institut Teknologi Bandung, Geophysical Engineering Study Program, Faculty of Mining and Petroleum Engineering, Bandung, Indonesia (GRID:grid.434933.a) (ISNI:0000 0004 1808 0563)