Isotropic events observed with a borehole array in the Chelungpu fault zone, Taiwan

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Title:	Isotropic events observed with a borehole array in the Chelungpu fault zone, Taiwan
Authors:	馬國鳳;Ma, Kuo-Fong;Lin, Yen-Yu;Lee, Shiann-Jong;Mori, Jim;Brodsky, Emily E.
Contributors:	地球科學學院地球科學學系
Keywords:	Amplitude;Applied geophysics;Boreholes;Earth sciences;Earth, ocean, space;Earthquakes;Exact sciences and technology;Fault lines;Fault zones;Fluid mechanics;Fluid permeability;High pressure;Hydraulic fracturing;Hydraulics;Internal geophysics;Noise spectra;P waves;Plate tectonics;Rocks;S waves;Seismic activity;Seismographs;Seismology;Solid-earth geophysics, tectonophysics, gravimetry;Tectonics. Structural geology. Plate tectonics;Waveforms
Date:	2012-07-27
Issue Date:	2026-04-23 11:37:06 (UTC+8)
Publisher:	American Association for the Advancement of Science;Washington, DC: American Association for the Advancement of Science
Abstract:	摘要： Shear failure is the dominant mode of earthquake-causing rock failure along faults. High fluid pressure can also potentially induce rock failure by opening cavities and cracks, but an active example of this process has not been directly observed in a fault zone. Using borehole array data collected along the low-stress Chelungpu fault zone, Taiwan, we observed several small seismic events (I-type events) in a fluid-rich permeable zone directly below the impermeable slip zone of the 1999 moment magnitude 7.6 Chi-Chi earthquake. Modeling of the events suggests an isotropic, nonshear source mechanism likely associated with natural hydraulic fractures. These seismic events may be associated with the formation of veins and other fluid features often observed in rocks surrounding fault zones and may be similar to artificially induced hydraulic fracturing. 其他題名： Science 出版者： Washington, DC: American Association for the Advancement of Science 出版日期： 2012-07-27 出處： Science (American Association for the Advancement of Science), 2012-07, Vol.337 (6093), p.459-463 資源來源： American Association for the Advancement of Science 版權： Copyright © 2012 American Association for the Advancement of Science 版權： 2015 INIST-CNRS 版權： Copyright © 2012, American Association for the Advancement of Science 識別號： ISSN: 0036-8075 識別號： ISSN: 1095-9203 識別號： EISSN: 1095-9203 識別號： DOI: 10.1126/science.1222119 識別號： PMID: 22837526 識別號： CODEN: SCIEAS
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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