Evolution of the Nankai Trough décollement from the trench into the seismogenic zone: Inferences from three-dimensional seismic reflection imaging
書誌事項
- 公開日
- 2004
- DOI
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- 10.1130/g20211.2
- 公開者
- Geological Society of America
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説明
We mapped the amplitude of the Nankai Trough subduction thrust seismic reflection from the trench into the seismogenic zone with three-dimensional seismic reflection data. The decollement thrust forms within the lithologically homogeneous Lower Shikoku Basin facies along an initially nonreflective interface. The reflection develops from a porosity contrast between accreted and underthrust sedimentary material because of accretionary wedge consolidation and rapid loading and delayed consolidation of the underthrust section. A decollement-amplitude map shows a significant decline from high amplitudes at the trench to barely detectable levels 25–30 km landward. Three other observations coincide with the amplitude decline: (1) the decollement initially steps down to deeper stratigraphic levels, (2) the wedge taper increases dramatically, and (3) the thrust becomes seismogenic. The amplitude decline and the coincident decollement and accretionary- wedge tectonic and seismogenic behavior are attributed to the loss of fluids and potentially loss of excess fluid pressures downdip along the subduction thrust.
収録刊行物
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- Geology
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Geology 32 (4), 273-, 2004
Geological Society of America
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詳細情報 詳細情報について
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- CRID
- 1361137045983041280
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- DOI
- 10.1130/g20211.2
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- ISSN
- 00917613
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- データソース種別
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- Crossref
- OpenAIRE