| Full text | |
| Author(s): |
Total Authors: 3
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| Affiliation: | [1] IAG USP, Dept Geophys, Inst Astron Geophys & Atmospher Sci, BR-05508090 Sao Paulo - Brazil
[2] INPE, Sao Jose Dos Campos - Brazil
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | JOURNAL OF APPLIED GEOPHYSICS; v. 68, n. 2, p. 231-242, JUN 2009. |
| Web of Science Citations: | 6 |
| Abstract | |
Flood basalts in the Parana Basin make exploration of the deeper sedimentary sequence more difficult with seismic reflection methods. We present a new method to obtain information about sub-basalt layers by joint inversion of high-frequency Receiver Functions (RF) and Magnetotelluric (MT) data. Using genetic algorithm, which is more flexible to incorporate data variance in the objective function, we obtain 1D models of the main layers of the basin beneath three seismographic stations. We show that the joint inversion produces more stable models than inversion of RF or MT data alone. Thicknesses of the basalt layer were estimated at I km, and basement depth were found to range from 3.8 to 4.3 km, roughly consistent with expected values based on the sparse regional borehole data. Deep earthquakes in the nearby Nazca plate subduction zone are a good source of high frequency P-waves making the joint RF + MT inversion a promising method to study shallow intracratonic basins in Brazil, especially where the sedimentary structure can be represented by I D models. (c) 2008 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 00/00806-5 - Probing geoelectrical structures in the upper-mantle under the shield in South-Central Brazil |
| Grantee: | Icaro Vitorello |
| Support Opportunities: | Research Projects - Thematic Grants |