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| Titel |
The vague volcano-seismic clock of the South American Pacific margin |
| VerfasserIn |
G. Scalera |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 8th EGU Alexander von Humboldt Conference "Natural Disasters, Global Change, and the Preservation of World Heritage Sites" ; Nr. 35 (2013-08-13), S.89-103 |
| Datensatznummer |
250086167
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| Publikation (Nr.) |
 copernicus.org/adgeo-35-89-2013.pdf |
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| Zusammenfassung |
| During his trip on the Beagle, Charles Darwin wrote about the eruptions
associated with the Concepción earthquake of 1835. A later survey by
Lorenzo Casertano, following the great 1960 Chilean earthquake, identified
some unclear evidence of a link between eruptions and the seismic event,
although some reservations were also raised. Using data available in 2006 in
the Smithsonian Institution Catalogue of volcanic eruptions, Scalera
revealed grounded evidence that South-American Wadati-Benioff zone
earthquakes of magnitudes greater than 8.4 are associated with an increased
rate of volcanic eruptions, but it was still impossible to determine a
causal link between the two phenomena. An average return period of about 50 yr was deducible from the data for the time window 1800–1999. After 2006,
the Smithsonian Institution's effort to improve our knowledge of this region
has greatly increased the completeness of the catalogue, adding the
eruptions from the 2000–2010 interval, together with 50 % more new entries
in the list of Andean volcanoes. The great Chilean Maule earthquake of 27 February 2010 (M=8.8), occurring exactly five decades after the 1960
event, provided an occasion to reanalyse this updated database. The results
suggest a preferential causal eruptions-earthquake relationship, but
additional future volcano-seismic events should be studied to arrive at a
definitive conclusion, within the perspective of using this phenomenon for
Civil Protection. The possible correlation of South American volcano-seismic
events with the Markowitz oscillation of the Polar Motion is another good
reason for trying to establish an integrated geodynamic explanation. |
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