eprintid: 1773 rev_number: 10 eprint_status: archive userid: 6 dir: disk0/00/00/17/73 datestamp: 2016-09-16 08:09:14 lastmod: 2017-02-08 12:21:34 status_changed: 2016-09-16 08:09:14 type: article metadata_visibility: show creators_name: Gahalaut, Kalpna creators_name: Tuan, Thai Anh creators_name: Purnachandra Rao, N. corp_creators: CSIR-National Geophysical Research Institute,India. corp_creators: CSIR-National Geophysical Research Institute,India. corp_creators: CSIR-National Geophysical Research Institute,India. title: Rapid and Delayed Earthquake Triggering by the Song Tranh 2 Reservoir, Vietnam subjects: MP4 subjects: RV2 subjects: SR divisions: EPOS-ESI5 full_text_status: none abstract: Impoundment of the Song Tranh 2 reservoir in Vietnam was started in late 2010, and earthquakes started occurring in its vicinity soon after that. Frequency of earthquakes increased after the reservoir water level was brought down in June 2012. We computed the influence of the reservoir water load and pore pressure and used the concept of fault stability. The reservoir water load alone destabilized existing predominantly dextral strike-slip faults of the region and hence led to triggering of earthquakes soon after its impoundment. Pore pressure further destabilized these faults and brought additional faults under destabilization. Time delay between the maximum reservoir water level and pore pressure buildup due to diffusion leads us to conclude that the increase in seismicity at low water stands in the reservoir is primarily due to the increase in pore pressure during that period. We propose that this is an unambiguous case of rapid and delayed earthquake triggering by a reservoir impoundment. date: 2016-10 date_type: published publication: Bulletin of the Seismological Society of America volume: 106 number: 5 publisher: Seismological Society of America id_number: doi:10.1785/0120160106 issn: 0037-1106 official_url: http://doi.org/10.1785/0120160106 access_IS-EPOS: limited owner: Publisher citation: Gahalaut, Kalpna and Tuan, Thai Anh and Purnachandra Rao, N. (2016) Rapid and Delayed Earthquake Triggering by the Song Tranh 2 Reservoir, Vietnam. Bulletin of the Seismological Society of America, 106 (5). DOI: https://doi.org/10.1785/0120160106