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Basin inversion in central Taiwan and its importance for seismic hazard

2013; Geological Society of America; Volume: 42; Issue: 2 Linguagem: Inglês

10.1130/g35102.1

1943-2682

Giovanni Camanni, Chi-Hsuan Chen, Dennis Brown, Joaquina Álvarez-Marrón, Yih‐Min Wu, Hsi-An Chen, Hsin‐Hua Huang, Hao‐Tsu Chu, Mien-Ming Chen, Chien‐Hsin Chang,

Seismic Imaging and Inversion Techniques

Research Article| February 01, 2014 Basin inversion in central Taiwan and its importance for seismic hazard Giovanni Camanni; Giovanni Camanni 1Institute of Earth Sciences Jaume Almera, ICTJA-CSIC, Lluis Sole i Sabaris s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar Chi-Hsuan Chen; Chi-Hsuan Chen 2Central Geological Survey, P.O. Box 968, Taipei 235, Taiwan3Department of Geosciences, National Taiwan University, Taipei 106, Taiwan Search for other works by this author on: GSW Google Scholar Dennis Brown; Dennis Brown 1Institute of Earth Sciences Jaume Almera, ICTJA-CSIC, Lluis Sole i Sabaris s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar Joaquina Alvarez-Marron; Joaquina Alvarez-Marron 1Institute of Earth Sciences Jaume Almera, ICTJA-CSIC, Lluis Sole i Sabaris s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar Yih-Min Wu; Yih-Min Wu 3Department of Geosciences, National Taiwan University, Taipei 106, Taiwan Search for other works by this author on: GSW Google Scholar Hsi-An Chen; Hsi-An Chen 3Department of Geosciences, National Taiwan University, Taipei 106, Taiwan Search for other works by this author on: GSW Google Scholar Hsin-Hua Huang; Hsin-Hua Huang 3Department of Geosciences, National Taiwan University, Taipei 106, Taiwan Search for other works by this author on: GSW Google Scholar Hao-Tsu Chu; Hao-Tsu Chu 2Central Geological Survey, P.O. Box 968, Taipei 235, Taiwan Search for other works by this author on: GSW Google Scholar Mien-Ming Chen; Mien-Ming Chen 2Central Geological Survey, P.O. Box 968, Taipei 235, Taiwan Search for other works by this author on: GSW Google Scholar Chien-Hsin Chang Chien-Hsin Chang 4Central Weather Bureau, Taipei 10048, Taiwan Search for other works by this author on: GSW Google Scholar Author and Article Information Giovanni Camanni 1Institute of Earth Sciences Jaume Almera, ICTJA-CSIC, Lluis Sole i Sabaris s/n, 08028 Barcelona, Spain Chi-Hsuan Chen 2Central Geological Survey, P.O. Box 968, Taipei 235, Taiwan3Department of Geosciences, National Taiwan University, Taipei 106, Taiwan Dennis Brown 1Institute of Earth Sciences Jaume Almera, ICTJA-CSIC, Lluis Sole i Sabaris s/n, 08028 Barcelona, Spain Joaquina Alvarez-Marron 1Institute of Earth Sciences Jaume Almera, ICTJA-CSIC, Lluis Sole i Sabaris s/n, 08028 Barcelona, Spain Yih-Min Wu 3Department of Geosciences, National Taiwan University, Taipei 106, Taiwan Hsi-An Chen 3Department of Geosciences, National Taiwan University, Taipei 106, Taiwan Hsin-Hua Huang 3Department of Geosciences, National Taiwan University, Taipei 106, Taiwan Hao-Tsu Chu 2Central Geological Survey, P.O. Box 968, Taipei 235, Taiwan Mien-Ming Chen 2Central Geological Survey, P.O. Box 968, Taipei 235, Taiwan Chien-Hsin Chang 4Central Weather Bureau, Taipei 10048, Taiwan Publisher: Geological Society of America Received: 09 Sep 2013 Revision Received: 28 Oct 2013 Accepted: 05 Nov 2013 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2014 Geological Society of America Geology (2014) 42 (2): 147–150. https://doi.org/10.1130/G35102.1 Article history Received: 09 Sep 2013 Revision Received: 28 Oct 2013 Accepted: 05 Nov 2013 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Giovanni Camanni, Chi-Hsuan Chen, Dennis Brown, Joaquina Alvarez-Marron, Yih-Min Wu, Hsi-An Chen, Hsin-Hua Huang, Hao-Tsu Chu, Mien-Ming Chen, Chien-Hsin Chang; Basin inversion in central Taiwan and its importance for seismic hazard. Geology 2014;; 42 (2): 147–150. doi: https://doi.org/10.1130/G35102.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract On 27 March 2013, a 6.2 ML earthquake occurred at 19 km depth in eastern Nantou, central Taiwan. Over a 2 week period it was followed by more than 680 aftershocks that ranged to 5 ML. Most events occurred below the ∼10-km-deep detachment fault predicted for this part of the mountain belt, coinciding with other precisely located hypocenters that indicate that much of the crust in this area is seismically active. We combine geological data with a three-dimensional (3-D) P-wave velocity model derived from local tomography and earthquake hypocenters to determine a model for the structure of central Taiwan. Much of the surface geology of the area comprises the uplifted Eocene rocks of the Hsuehshan Basin. The 3-D P-wave velocity model shows a shallowing of higher velocities across the Hsuehshan Basin and hypocenter data indicate that its western bounding fault is clearly defined by an eastward-dipping band of events that extends to >20 km depth. The eastern bounding fault is interpreted to coincide at depth with a cluster of events between 20 and 30 km depth. These data suggest that the preexisting, rift-related extensional faults of the Hsuehshan Basin are currently being reactivated and the basin is being inverted. We present hypocenter data from the Nantou sequence that corroborate this interpretation and show the importance of choosing the correct structural model when assessing seismic risk. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.