Earthquakes in Switzerland and surrounding regions during 2014

Autor: Tobias Diehl, Deichmann, Nicolas, Clinton, John, Kaestli, Philipp, Cauzzi, Carlo, Kraft, Toni, Behr, Yannik, Edwards, Benjamin, Guilhem, Aurelie, Korger, Edith, Hobiger, Manuel, Haslinger, Florian, Faeh, Donat, Wiemer, Stefan
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: Swiss Journal of Geosciences, 108 (2-3)
ResearcherID
ISSN: 1661-8734
1661-8726
DOI: 10.3929/ethz-b-000107481
Popis: During 2014, 817 earthquakes and 180 quarry blasts were detected and located in the region under consideration. An additional 160 earthquakes with ML ≤ 1.0 were located using supplementary analysis techniques. The number of located earthquakes in 2014 was the largest since the installation of a seismic network in Switzerland in 1975. This unusually large number is mainly due to the occurrence of two vigorous earthquake sequences, and the local reduction of the earthquake detection thresholds of the Swiss seismic network. With a total of 22 earthquakes of ML ≥ 2.5, the seismic activity of larger and potentially felt events was close to the average of 23 earthquakes over the previous 39 years. The most noteworthy seismicity was the earthquake sequence near Diemtigen, west of Lake Thun, where more than 270 events were located between April and December. High-precision hypocenter relocation was applied to image the spatio-temporal evolution of this seismicity. The sequence culminated in an M L 3.2 event in October, which was felt in the region of Lake Thun and Bern. Other cases of earthquakes felt by the public include earthquakes in the region of Biel (ML 3.2), in Vallorcine (ML 3.2), and in Stalden (ML 3.0). Finally, a small but unusually deep earthquake was recorded beneath the Jura Mountains. Focal depth, apparent velocities, as well as waveform characteristics of this earthquake are consistent with a source in the uppermost mantle. This earthquake is the first reliable record of a sub-Moho event ever observed in Switzerland.
Swiss Journal of Geosciences, 108 (2-3)
ISSN:1661-8734
ISSN:1661-8726
Databáze: OpenAIRE
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