Source parameters of two moderate Mexican earthquakes estimated from a single-station, near-source recording, and from MT inversion of regional data: a comparison of the results
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| Format: | Artículo científico |
| Sprache: | en |
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Universidad Nacional Autónoma de México
1998
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| _version_ | 1876480128026935296 |
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| author | Shri K. Singh |
| author_facet | Shri K. Singh |
| contents | Source parameters of two moderate Mexican earthquakes estimated from a single-station, near-source recording, and from MT inversion of regional data: a comparison of the results Shri K. Singh Javier F. Pacheco Ciencias de la Tierra near Source parameters source seismograms moment tensor inversion for regional data Two recent, moderate earthquakes (March 27, 1996, Mw=5.4; January 21, 1997, Mw=5.4), which occurred close to the town ofPinotepa Nacional, Oaxaca, Mexico, were recorded at the near-source VBB station of PNIG and by several other stations of theMexican VBB seismological network located at regional distance. Both events saturated the velocity sensor (STS-2) at PNIG. Wefirst use velocity and displacement records, obtained by direct integration of the accelerograms at PNIG, to obtain location, depth,origin time, focal mechanism, seismic moment, and source time function of the two earthquakes. We then perform a momenttensor (MT) inversion of regional band-pass filtered (20 to 50 sec) displacement seismograms to estimate the source parameters ofthe two earthquakes. For these events, the MT solutions are reasonably close to those obtained from the near-source data of thesingle station of PNIG. Our results show that: (a) detailed source parameters can be retrieved from a single, near-source, highqualitythree-component recording, and (b) a rough estimation of focal mechanism and seismic moment of Mexican earthquakesmay be possible from MT inversion of regional data using presently known crustal structure. But more precise determinationswould require a better knowledge of this structure, mainly to estimate the centroid depth. 1998 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56837204 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.2 Vol.37 |
| format | Artículo científico |
| id | redalyc_56837204 |
| institution | Redalyc |
| language | en |
| publishDate | 1998 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Source parameters of two moderate Mexican earthquakes estimated from a single-station, near-source recording, and from MT inversion of regional data: a comparison of the results Shri K. Singh Ciencias de la Tierra near Source parameters source seismograms moment tensor inversion for regional data Source parameters of two moderate Mexican earthquakes estimated from a single-station, near-source recording, and from MT inversion of regional data: a comparison of the results Shri K. Singh Javier F. Pacheco Ciencias de la Tierra near Source parameters source seismograms moment tensor inversion for regional data Two recent, moderate earthquakes (March 27, 1996, Mw=5.4; January 21, 1997, Mw=5.4), which occurred close to the town ofPinotepa Nacional, Oaxaca, Mexico, were recorded at the near-source VBB station of PNIG and by several other stations of theMexican VBB seismological network located at regional distance. Both events saturated the velocity sensor (STS-2) at PNIG. Wefirst use velocity and displacement records, obtained by direct integration of the accelerograms at PNIG, to obtain location, depth,origin time, focal mechanism, seismic moment, and source time function of the two earthquakes. We then perform a momenttensor (MT) inversion of regional band-pass filtered (20 to 50 sec) displacement seismograms to estimate the source parameters ofthe two earthquakes. For these events, the MT solutions are reasonably close to those obtained from the near-source data of thesingle station of PNIG. Our results show that: (a) detailed source parameters can be retrieved from a single, near-source, highqualitythree-component recording, and (b) a rough estimation of focal mechanism and seismic moment of Mexican earthquakesmay be possible from MT inversion of regional data using presently known crustal structure. But more precise determinationswould require a better knowledge of this structure, mainly to estimate the centroid depth. 1998 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56837204 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.2 Vol.37 |
| title | Source parameters of two moderate Mexican earthquakes estimated from a single-station, near-source recording, and from MT inversion of regional data: a comparison of the results |
| topic | Ciencias de la Tierra near Source parameters source seismograms moment tensor inversion for regional data |
| url | https://www.redalyc.org/articulo.oa?id=56837204 |