대반 북부 대둔화산대에서의 지진관측: 대북시 부근의 지진/화산 위험성

Title
대반 북부 대둔화산대에서의 지진관측: 대북시 부근의 지진/화산 위험성
Alternative Title
Modern Seismic Observations in the Tatun Volcano Region of Northern Taiwan:Seismic/Volcanic Hazard Adjacent to the Taipei Metropolitan Area
Author(s)
김광희; C. Chang; K.-F. Ma; J.-M. Chiu; K.-C. Chen
Publication Year
2006-12-11
Abstract
The Tatun volcano group is located adjacent to the Taipei metropolitan area in northern Taiwan and was a result of episodic volcanisms between 2.8 and 0.2 Ma. Earthquake data collected over the last 30 years are analyzed to explore seismicity pattern and their associated mechanism of faulting in the area. Using a Joint Hypocenter Determination (JHD) method, a few sequences of relocated earthquake hypocenters are tightly clustered which seem to be blurry in the original catalog locations. Numerous earthquakes, previously unnoticed and not reported in the CWB catalog, have been identified from a careful examination of the continuous recordings from a nearby broadband seismic station. These newly identified earthquakes show similarities in waveforms and arrival time differences between the direct P- and S-waves indicating that their hypocenter locations are very close to each other and their source mechanisms are similar. A relatively high b-value of 1.22 is obtained from the analysis of crustal earthquakes (depth < 30 km) in the region, which may suggest that clustered local seismicity in the Tatun volcanic region probably resulted from subsurface hydrothermal or volcano-related activities. Focal mechanism solutions determined in this study are dominated by normal faulting. Thus, these earthquake clusters are most probably associated with hydrothermal/magmatic activities in a back-arc extensional environment.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/30695
Bibliographic Citation
American Geophysical Union Fall Meeting, pp.v41c - 1750, 2006
Publisher
American Geophysical Un
Type
Conference
Language
English
Publisher
American Geophysical Un
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