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Re‐evaluating an active fault in a major computer‐manufacturing area in northern Taiwan using ‘1 sec’ shallow reflection seismics
Author(s) -
Wang ChienYing,
Lee YiHen,
Hu YuYen
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl022344
Subject(s) - geology , décollement , seismology , reflection (computer programming) , fault (geology) , active fault , thrust fault , tectonics , computer science , programming language
Recently abundant evidence from surface geologic investigation has been cited to identify an active fault which happens to pass through a major computer‐manufacturing area in northern Taiwan. Great public concern has arisen as a consequence. In this paper, we use ‘1 sec’ high‐resolution shallow seismic reflection sections to examine the near‐surface structure of this fault. The results, however, do not support the geologic observations. A folding above a shallow decollement was found in the fault's northern portion, which may include shallow minor faulting. In the remaining portion, the structural layers were found to lie flat without offsets, except for slight buckling. The fault could have displacements at deeper places (‘blind thrust’?), but the shallow parts do not seem much affected. These results indicate that the threat of active faulting in the area is actually less than previously feared.