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| Format: | Artículo científico |
| Sprache: | en |
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Universidad Nacional Autónoma de México
2007
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=56846102 |
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| author | Giancarlo Scalera |
| author_facet | Giancarlo Scalera |
| contents | Geodynamics of the Wadati-Benioff zone earthquakes: The 2004 Sumatra earthquake and other great earthquakes Giancarlo Scalera Ciencias de la Tierra Geodynamics polar motion expanding Earth great earthquakes volcanic eruptions The displacement of the Earths instantaneous rotation pole observed at ASI of Matera, Italy the seismic data (USGS)in the two days following the main shock, the high frequency P-wave radiation, the geomorphologic data, and the satellite data ofuplift/subsidence of the coasts (IGG) converge toward a new interpretation of the Great Sumatran earthquake (TU=26 December2004 - 00h 58m, Lat=3.3°N, Lon=95.8°E, H=10 km, M=9.3) based on the second conjugate nearly vertical CMT fault planesolution. In a non-double-couple treatment that considers non-negligible non-elastic contributions to the earthquake phenomena,only a nearly vertical fault can explain both high values of seismic moment and the ≈3.0 mas (≈10 cm) polhody displacementtoward an azimuth exactly opposite to the epicentre azimuth.Case-histories of great earthquakes are then reviewed to highlight the overall analogies. The similarity of the verticaldisplacements shown by these earthquakes (Chile 1960, Alaska 1964, ) leads to a common interpretation necessitating resortto a prevailing uprising of lithospheric material. This interpretation is supported by the inspection of the irregularities of thehypocentre distribution along the Wadati-Benioff zones. Moreover, in the case of great South American earthquakes, a volcaniceruptions-earthquakes correlation is clearly recognisable.A thorough revision of the pure elastic rebound model of great earthquakes occurrence and a complete overcoming of thelarge scale subduction concept is then needed. 2007 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56846102 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.46 |
| format | Artículo científico |
| id | redalyc_56846102 |
| language | en |
| publishDate | 2007 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Geodynamics of the Wadati-Benioff zone earthquakes: The 2004 Sumatra earthquake and other great earthquakes Giancarlo Scalera Ciencias de la Tierra Geodynamics polar motion expanding Earth great earthquakes volcanic eruptions Geodynamics of the Wadati-Benioff zone earthquakes: The 2004 Sumatra earthquake and other great earthquakes Giancarlo Scalera Ciencias de la Tierra Geodynamics polar motion expanding Earth great earthquakes volcanic eruptions The displacement of the Earths instantaneous rotation pole observed at ASI of Matera, Italy the seismic data (USGS)in the two days following the main shock, the high frequency P-wave radiation, the geomorphologic data, and the satellite data ofuplift/subsidence of the coasts (IGG) converge toward a new interpretation of the Great Sumatran earthquake (TU=26 December2004 - 00h 58m, Lat=3.3°N, Lon=95.8°E, H=10 km, M=9.3) based on the second conjugate nearly vertical CMT fault planesolution. In a non-double-couple treatment that considers non-negligible non-elastic contributions to the earthquake phenomena,only a nearly vertical fault can explain both high values of seismic moment and the ≈3.0 mas (≈10 cm) polhody displacementtoward an azimuth exactly opposite to the epicentre azimuth.Case-histories of great earthquakes are then reviewed to highlight the overall analogies. The similarity of the verticaldisplacements shown by these earthquakes (Chile 1960, Alaska 1964, ) leads to a common interpretation necessitating resortto a prevailing uprising of lithospheric material. This interpretation is supported by the inspection of the irregularities of thehypocentre distribution along the Wadati-Benioff zones. Moreover, in the case of great South American earthquakes, a volcaniceruptions-earthquakes correlation is clearly recognisable.A thorough revision of the pure elastic rebound model of great earthquakes occurrence and a complete overcoming of thelarge scale subduction concept is then needed. 2007 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56846102 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.46 |
| title | Geodynamics of the Wadati-Benioff zone earthquakes: The 2004 Sumatra earthquake and other great earthquakes |
| topic | Ciencias de la Tierra Geodynamics polar motion expanding Earth great earthquakes volcanic eruptions |
| url | https://www.redalyc.org/articulo.oa?id=56846102 |