Earthquakes in Switzerland and surrounding regions during 2002

Manfred Baer*, Nicolas Deichmann, Jochen Braunmiller, Fabrizio Bernardi, Cécile Cornou, Donat Fäh, Domenico Giardini, Sarah Huber, Philipp Kästli, Fortunat Kind, Urs Kradolfer, Paul Mai, Silvio Maraini, Ivo Oprsal, Thomas Schler, Danijel Schorlemmer, Souad Sellami, Sibylle Steimen, Stefan Wiemer, Jochen WössnerAdrian Wyss

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

This report of the Swiss Seismological Service summarizes the seismic activity in Switzerland and surrounding regions during 2002. During this period, 546 earthquakes and 137 quarry blasts were detected and located in the region under consideration. The increase in the total number of recorded events relative to previous years is restricted to low magnitudes. It is due to the lower detection threshold of the new station network and to the occurrence of six earthquake swarms, which alone account for 39 % of the total seismic activity in 2002. In fact, with 27 events with ML ≥ 2.5, the seismic activity in the year 2002 was close to the average over the last 28 years. The strongest event, with ML = 3.8 and intensity I0 = V, occurred near Santa Maria Maggiore, between Valle Vigezzo and Valgrande, just beyond the border with Italy. As in previous years, most of the seismic activity during 2002 was concentrated in the Valais, the southeastern part of Graubünden and in the adjacent regions of northern Italy.

Original languageEnglish (US)
Pages (from-to)313-324
Number of pages12
JournalEcologae Geologicae Helvetiae
Volume96
Issue number2
StatePublished - Oct 20 2003

Keywords

  • Earthquakes
  • Focal mechanisms
  • Moment tensors
  • Switzerland

ASJC Scopus subject areas

  • Geology

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