Publisher： John Wiley & Sons Inc
E-ISSN： 2169-9356|2169-9313|8|5624-5638
ISSN： 2169-9313
Source： JOURNAL OF GEOPHYSICAL RESEARCH: SOLID EARTH, Vol.2169-9313, Iss.8, 2015-08, pp. : 5624-5638
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
AbstractDynamic triggering in western Fangshan Pluton, Beijing, China, has been repeatedly identified, but previous studies are limited by sparse seismic station coverage. Here we systematically analyze continuous waveforms recorded by both permanent stations and a temporary seismic network 40 days before and after the 11 March 2011 Mw 9.1 Tohoku‐Oki and the 14 April 2012 Mw 8.6 Indian Ocean earthquakes. We first build a template database using a short‐term average to long‐term average method. Next, we apply the matched filter technique that cross correlates the template waveforms with continuous data to detect additional seismic events. Overall, we detect 1956 and 950 seismic events around the Tohoku‐Oki and Indian Ocean main shocks, respectively. Most detected events are shallow (<5 km) and clustered at Beiling Syncline in western Fangshan Pluton, which is adjacent to a running coalmine. Seven and 10 events are detected during the large‐amplitude surface waves of the two main shocks, respectively, but no similar burst is detected following their major foreshock and aftershocks. Multiple statistical tests indicate that the short‐term bursts after the two main shocks are dynamically triggered. We suggest that mining‐related activities may perturb the subsurface stress conditions and hence make the region more susceptible for dynamic triggering than other places.
Access to resources
Recommend
