Isolated regions of remote triggering in South/Southeast Asia following the 2012 Mw 8.6 Indian Ocean earthquake

Large earthquakes are capable of triggering either shallow earthquakes or deep tectonic tremors at long‐range distances. So far, most of remotely triggered tremors were found along major plate boundary faults around the Pacific Rim. Here we conduct a systematic search for remotely triggered earthqua...

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Bibliographic Details
Published in:Geophysical research letters 2016-10, Vol.43 (20), p.10,654-10,662
Main Authors: Bansal, Abhey Ram, Yao, Dongdong, Peng, Zhigang, Sianipar, Dimas
Format: Article
Language:English
Subjects:
Amplitude
Basins
earthquake
Earthquakes
Fault lines
Faults
Geological faults
Indian Ocean
Plate boundaries
Rayleigh waves
remote triggering
Searching
Seismic activity
Shock
Southeast Asia
Subduction
Subduction (geology)
Subduction zones
Tectonics
Thrust
Tremors
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Summary:Large earthquakes are capable of triggering either shallow earthquakes or deep tectonic tremors at long‐range distances. So far, most of remotely triggered tremors were found along major plate boundary faults around the Pacific Rim. Here we conduct a systematic search for remotely triggered earthquakes and tremors in South/Southeast Asia following the 11 April 2012 Mw 8.6 Indian Ocean earthquake. We find additional evidence of triggered tectonic tremors beneath the Java Island and the Sulabes Island in Eastern Indonesia and triggered earthquakes in Vietnam. Tremors mostly occurred during the large‐amplitude Rayleigh waves of the Indian Ocean main shock and were also triggered by several other large distant earthquakes. Although we are unable to locate them, they were recorded at stations close to major tectonic faults, suggesting that they are likely of tectonic origin. However, we find no evidence of triggered tremor/earthquakes along the Sumatra subduction zone and eastern portion of Himalaya frontal thrusts, indicating that remote triggering was not as widespread as previously thought. Key Points We find three new sites of remotely triggered activity in South/Southeast Asia following the 2012 Indian Ocean earthquake Triggered tremors/earthquakes mostly occurred during the large‐amplitude Rayleigh waves and were close to active faults We did not find any clear evidence of remotely triggered seismicity along the Sumatra subduction zone and northeastern Himalaya frontal thrusts
ISSN:0094-8276
1944-8007
DOI:10.1002/2016GL069955