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Brittle faults and kinematic indicators have been measured systematically below and above the major late alpine extensional Simplon fault in the vicinity of Simplonpass. Paleo-stress inversion has been conducted for a total of over 1200 fault measurements, from 62 sites. Minor faults in both hanging-and footwall of the Simplon fault define a coherent paleo-stress field with SW-NE oriented maximum horizontal extension and near vertical compression. The kinematics of these latest brittle deformations are in very good agreement with the ductile, slightly older deformations recorded within the Simplon fault mylonites (Mancktelow 1990). Paleo-stress orientations obtained from sets of the latest brittle faults are clearly different from the present day stress field as derived from earthquake focal plane mechanisms. The latter define a nearly N-S oriented maximum horizontal extension direction (Kastrup 2002), at a high angle to the downdip direction of the Simplon fault lineation. The present day stress orientation is ill orientatated for a reactivation of the Simplon fault and its associated minor fractures. ZUSAMMENFASSUNGEine systematische Analyse von Sprödbrüchen ober-und unterhalb der Simplonstörung wurde in der Gegend des Simplonpasses durchgeführt. Die Inversion von über 1200 Bruchmessungen an 62 Messstationen erlaubt die Interpolation eines regionalen Paläo-Stressfeldes. Die gemessenen Sekundärbrüche sind weitgehend mit einem regional kohärenten Stresstensor zu erklären der eine SW-NE orientierte Streckung und eine nahezu senkrechte Kompression aufweist. Kinematisch passen diese späten Brüche sehr gut mit der etwas älte-ren, sehr intensiven plastischen Deformation der Mylonite entlang der Simplon Scherzone zusammen (Mancktelow 1990). Die Orientierung der Paläo-Stressachsen ist deutlich verschieden von der heute beobachteten Stressorientierung. Erdbeben-Herdflächenlösungen ergeben eine N-S orientierte Streckungsrichtung (Kastrup 2002), in einem grossen Winkel zur Lineation der Simplonstörung. Die heutige Stressorientierung ist demenstsprechend ungeeignet, um die Simplonstörung und die sie begleitenden Sekundärbrüche zu reaktivieren.
Brittle faults and kinematic indicators have been measured systematically below and above the major late alpine extensional Simplon fault in the vicinity of Simplonpass. Paleo-stress inversion has been conducted for a total of over 1200 fault measurements, from 62 sites. Minor faults in both hanging-and footwall of the Simplon fault define a coherent paleo-stress field with SW-NE oriented maximum horizontal extension and near vertical compression. The kinematics of these latest brittle deformations are in very good agreement with the ductile, slightly older deformations recorded within the Simplon fault mylonites (Mancktelow 1990). Paleo-stress orientations obtained from sets of the latest brittle faults are clearly different from the present day stress field as derived from earthquake focal plane mechanisms. The latter define a nearly N-S oriented maximum horizontal extension direction (Kastrup 2002), at a high angle to the downdip direction of the Simplon fault lineation. The present day stress orientation is ill orientatated for a reactivation of the Simplon fault and its associated minor fractures. ZUSAMMENFASSUNGEine systematische Analyse von Sprödbrüchen ober-und unterhalb der Simplonstörung wurde in der Gegend des Simplonpasses durchgeführt. Die Inversion von über 1200 Bruchmessungen an 62 Messstationen erlaubt die Interpolation eines regionalen Paläo-Stressfeldes. Die gemessenen Sekundärbrüche sind weitgehend mit einem regional kohärenten Stresstensor zu erklären der eine SW-NE orientierte Streckung und eine nahezu senkrechte Kompression aufweist. Kinematisch passen diese späten Brüche sehr gut mit der etwas älte-ren, sehr intensiven plastischen Deformation der Mylonite entlang der Simplon Scherzone zusammen (Mancktelow 1990). Die Orientierung der Paläo-Stressachsen ist deutlich verschieden von der heute beobachteten Stressorientierung. Erdbeben-Herdflächenlösungen ergeben eine N-S orientierte Streckungsrichtung (Kastrup 2002), in einem grossen Winkel zur Lineation der Simplonstörung. Die heutige Stressorientierung ist demenstsprechend ungeeignet, um die Simplonstörung und die sie begleitenden Sekundärbrüche zu reaktivieren.
this report of the swiss seismological service summarizes the seismic activity in switzerland and surrounding regions during 2008. During this period, 451 earthquakes and 75 quarry blasts were detected and located in the region under consideration. the three strongest events occurred in the Valais, near Lac des toules (M L 3.6), and in Graubünden, near Ilanz (M L 3.7) and Paspels (M L 4.0). Although felt by the population, they were not reported to have caused any damage. However, with a total of only 15 events with M L ≥ 2.5, the seismic activity in the year 2008 was far below the average over the previous 33 years. ZusAmmenfAssunGDieser bericht des schweizerischen erdbebendienstes stellt eine Zusammenfassung der im Vorjahr in der schweiz und umgebung aufgetretenen erd- IntroductionPast earthquake activity in and around switzerland has been documented in an uninterrupted series of annual reports from 1879 until 1963 (Jahresberichte des Schweizerischen Erdbebendienstes). three additional annual reports have been published for the years 1972-1974. these reports together with historical records of earthquakes dating back to the 13th century have been summarized by Pavoni (1977) and provided the basis for the first seismic hazard map of switzerland (sä-gesser & mayer-rosa 1978). With the advent of routine data processing by computer, the wealth of data acquired by the nationwide seismograph network has been regularly documented in bulletins with detailed lists of all recorded events (Monthly Bulletin of the Swiss Seismological Service). since 1996, annual reports summarizing the seismic activity in switzerland and surrounding regions have been published in the present form , 1999, 2001, 2003, 2005Deichmann et al. 1998 Deichmann et al. , 2000aDeichmann et al. , 2002Deichmann et al. , 2004 Deichmann et al. , 2006 Deichmann et al. , 2008. In the course of reassessing the seismic hazard in switzerland, a new uniform earthquake catalog covering both the historical and instrumental periods has been compiled (fäh et al. 2003). the data in the new earthquake catalog of switzerland (ecOs) are available on line (http://www.seismo.ethz.ch, swiss earthquake catalogs). the new seismic hazard map of switzerland based on this catalog was officially released in 2004(Giardini et al. 2004Wiemer et al. 2009). In addition, numerous studies covering different aspects of the recent seismicity of switzerland have been published in the scientific literature (for an overview and additional references see, e.g. Deichmann 1990;Pavoni & roth 1990;rüttener 1995;rüttener at al. 1996;Pavoni et al. 1997;Deichmann et al. 2000b; Kastrup et al. 2004;Kastrup et al. 2007). Data acquisition and analysis Seismic stations in operation during 2008the swiss seismological service operates two separate nationwide seismic networks, a high-gain broad-band seismometer earthquakes in switzerland and surrounding regions during 2008
This report of the Swiss Seismological Service summarizes the seismic activity in Switzerland and surrounding regions during 2004. During this period, 677 earthquakes and 96 quarry blasts were detected and located in the region under consideration. With 22 events with ML ≥ 2.5, the seismic activity in the year 2004 was close to the average over the last 30 years. As in previous years, most of the activity was concentrated in the Valais and in Graubünden. In addition, several moderate earthquakes occurred in the lower crust below the northern Alpine foreland. Unusual was that five earthquakes were sufficiently strong to cause ground shaking of intensity IV over large portions of the territory. Two were located in Switzerland (Liestal, ML 3.8, and Brugg, ML 4.0).
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