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19 April 2024 |
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Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project | | Kuo-Fong Ma
; Hidemi Tanaka
; Sheng-Rong Song
; Chien-Ying Wang
; Jih-Hao Hung
; Yi-Ben Tsai
; Jim Mori
; Yen-Fang Song
; Eh-Chao Yeh
; Wonn Soh
; Hiroki Sone
; Li-Wei Kuo
; Hung-Yu Wu
; | | Date: |
23 Nov 2006 | | Journal: | Nature, 444 (7118), 473-6 | | Abstract: | Determining the seismic fracture energy during an earthquake and understanding the associated creation and development of a fault zone requires a combination of both seismological and geological field data. The actual thickness of the zone that slips during the rupture of a large earthquake is not known and is a key seismological parameter in understanding energy dissipation, rupture processes and seismic efficiency. The 1999 magnitude-7.7 earthquake in Chi-Chi, Taiwan, produced large slip (8 to 10 metres) at or near the surface, which is accessible to borehole drilling and provides a rare opportunity to sample a fault that had large slip in a recent earthquake. Here we present the retrieved cores from the Taiwan Chelungpu-fault Drilling Project and identify the main slip zone associated with the Chi-Chi earthquake. The surface fracture energy estimated from grain sizes in the gouge zone of the fault sample was directly compared to the seismic fracture energy determined from near-field seismic data. From the comparison, the contribution of gouge surface energy to the earthquake breakdown work is quantified to be 6 per cent. | | Source: | PubMed, pmid17122854 doi: 10.1038/nature05253 | | Services: | Forum | Review | Favorites | |
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