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Is there a detachment beneath the Taiwan thrust belt? A view from seismic energy release

AuthorsBrown, Dennis ; Schimmel, Martin ; Alvarez-Marrón, Joaquina ; Camanni, Giovanni ; Wu, Y. M.
trust belt
seismic energy release
Issue Date2012
PublisherSociedad Geológica de España
CitationGeo-Temas 13: 175-175 (2012)
AbstractThe Taiwan thrust belt has generally been presented as being wedge-shaped, with a gently east-dipping, shallow basal detachment that extends from the frontal thrust to the eastern part of the Central Range. More recently, with a growing amount of precisely located, high-quality earthquake data indicating that much of the crust beneath the Taiwan thrust belt is seismically active, this model has come into question. Here we present an imaging technique based on cumulative seismic energy release to illuminate the deep structure beneath the Taiwan thrust belt. This data corroborates the previous interpretations of a shallow detachment beneath the Western Foothills, but it also indicates that this detachment does not continue eastward beneath the more internal ranges. We suggest that a model in which the Western Foothills and the Hsuehshan Range is a zone of transpression that involves nearly the entire crust better fits the available data. In this model, the Western Foothills detachment ramps down into the lower crust along the western flank of the Hsuehshan Range and is truncated by the Lishan fault. This implies that there is no structural linkage between the Hsuehshan and Central ranges and that there is no material transfer across the Lishan fault.
Identifiersissn: 1567-5172
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