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Title

Holocene deformation offshore Ventura basin, CA, constrained by new high-resolution geophysical data

AuthorsPerea, Héctor ; Ucarkus, Gülsen; Driscoll, Neal; Kent, Graham; Levy, Yuval; Rockwell, T.
Issue DateDec-2017
PublisherAmerican Geophysical Union
Citation2017 AGU Fall Meeting (2017)
AbstractThe Transverse Ranges (Southern California, USA) accommodate the contraction resulting from a regional restraining bend in the San Andreas Fault to form a thrust-and-fold belt system. The southern boundary of this system corresponds to the E-W trending Ventura basin, which is filled by more than 5 km of Pleistocene sediment and is shortening at about 10 mm/yr as inferred from geodetic data. Although the different thrust and folds are fairly well known in the onshore areas of the basin, there is still uncertainty about their continuation in the offshore. The analysis of new high-resolution (SIO CHIRP) and existing (USGS sparker and chirp) seismic data has allowed us to characterize better the active geological structures in the offshore. In the dataset, we have identified different latest Quaternary seismostratigraphic units and horizons, with the most regionally recognized being a transgressive surface (LGTS) associated to the Last Glacial maximum and subsequent sea level rise. A series of E-W regional folds related to thrust faults have deformed the LGTS producing highs and depressions. The correlation of these structures between profiles shows that they are elongated and parallel between them and continue to the coastline. In addition, considering their trend and kinematics, we have been able to tie them with the main onshore active thrusts and folds. Above the LGTS we have identified progradational and agradational units that are related to global sea level rise, which exhibit less deformation (folding and faulting) than the lower units and horizons. However, we have recognized some specific fold growth sequences above LGTS associated with the activity of different thrust-related anticlines. Accordingly, we have identified between 3 and 5 tectonic deformation events (e.g., earthquakes) associated to thrust fault activity. These results may help us to determine the deformation history for the offshore Ventura basin and the potentiality of the thrust faults that may be tsunamigenic, and compare our observations to the onshore results
DescriptionAmerican Geophysical Union Fall Meeting, 11-15 December 2017, New Orleans
Publisher version (URL)https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/258159
URIhttp://hdl.handle.net/10261/171696
Appears in Collections:(ICM) Comunicaciones congresos
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