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Seismic imaging of the lithosphere-asthenosphere boundary with a dense broadband array in central California
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hoots, Charles R. |
| Copyright Year | 2016 |
| Abstract | OF THESIS Lithospheric attachment to the high-velocity Isabella anomaly (IA) in central California was tested by mapping the lateral extent of interruption of the lithosphere-asthenosphere boundary (LAB). The study area spans the location of two plausible origins for the anomaly, the Monterey microplate (Wang et al., 2013) and Sierra Nevada batholith (Ducea & Saleeby, 1998). Results include 918 binned receiver functions that were made using multi-channel spectral deconvolution and an array-based spectral source estimation on the event data from an 18month deployment of a high density array from the coast to the Sierra Nevada crossing the lateral location of the Isabella anomaly. Common conversion point (CCP) scattered wave imaging shows a strong negative velocity gradient (NVG) west of the San Andreas Fault (SAF) and a gap in a NVG horizon east of the SAF. This is interpreted as prominent arrivals at the base of a partially subducted microplate that become undetectable as the plate dips too steeply east of the SAF for reliable recovery of Sp converted phases. The gap in consistent NVG arrivals would indicate a local disruption of the LAB along the lateral extent of the anomaly. Although the LAB disruption cannot constrain the tectonic origin of the Isabella anomaly, it does indicate the anomaly is |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://digitalrepository.unm.edu/cgi/viewcontent.cgi?article=1035&context=eps_etds |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
