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Geology; September 2004; v. 32; no. 9; p. 769-772; DOI: 10.1130/G20753.1
© 2004 Geological Society of America
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Coseismic release of water from mountains: Evidence from the 1999 (Mw = 7.5) Chi-Chi, Taiwan, earthquake

Chi-yuen Wang1, Chung-Ho Wang2 and Michael Manga3

1 Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA
2 Institute of Earth Sciences, Academia Sinica, Nankang, Taiwan
3 Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA

Earthquake-induced increases in streamflow, producing ~0.7 km3 of total excess water, were documented after the 1999 (Mw = 7.5) Chi-Chi earthquake in central Taiwan. Analysis of stream gauge data and well records suggests that the excess water originated in the mountains. We propose that the extensive high-angle fractures formed during the earthquake allow rapid release of water from mountains and that mountains in tectonically active areas may be repeatedly flushed by meteoric water at time intervals comparable to the recurrence time of large earthquakes.

Key Words: streamflow • earthquake • mountains • hydrology • active tectonics




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