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Earthquakes in Germany are relatively weak but occur several times a year, some of them in coal mining areas where blasting sets them off. Following a 4.0 quake, attributed to mining and centered in Saarwellingen, around 1,000 demonstrators protested on 24 February 2008, demanding an end to mining work. Reportedly, the tremor knocked over chimneys and caused power outages.〔("Quake Shakes Western Germany" ), SkyNews, 24 February 2008〕 Most of the quakes occur in a seismically active zone associated with the Rhine Rift Valley that extends from Basel, Switzerland, into the Benelux countries, in particular in the "Cologne Bight". There are also earthquake zones on the northern edge of the Alps, around Lake Constance, in the Vogtland, around Gera and in the Leipzig plain.〔(【引用サイトリンク】title= Where in Germany does the earth quake?: Seismicity (or earthquake activity) in Germany )〕 〔Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) (Epizentrenkarten der Bundesrepublik Deutschland mit Randgebieten ) (German), retrieved 26 May 2010.〕 ==Geology== Germany is transected by parts of the European Cenozoic Rift System, particularly the Upper and Lower Rhine Grabens, and these areas remain tectonically active today. This zone of intraplate deformation is caused by the continuing effects of the Alpine orogeny as the African Plate continues to push northwards into the Eurasian Plate.〔("System Explanation of Earthquakes in Germany and Central Europe" ), Natural Disasters Networking Platform, quoting from G. Grünthal, "Erdbeben und Erdbebengefährdung in Deutschland sowie im europäischen Kontext", ''Geographie und Schule'' 151 (2004), 14-23〕 Seismologists consider earthquakes up to 6.4 on the Richter scale theoretically possible in the Lower Rhine Graben seismic zone.〔Klaus-G. Hinzen and Sharon K. Reamer, "Seismicity, seismotectonics, and seismic hazard in the northern Rhine area", Geological Society of America special papers, (Abstract ), 29 November 2006, retrieved 29 May 2010, refers to a maximum magnitude of 7.0.〕 Earthquakes there occur sporadically and at magnitudes that are relatively low by international standards. However, the region is the most seismically active and experiences the strongest quakes in Germany. A strong earthquake (approximately 5.5 to 6.0 on the Richter scale) occurs there approximately every 200 years on the average. A stronger earthquake would endanger cities including Aachen, Bonn, Düren, Düsseldorf, Grevenbroich, Heinsberg, Koblenz, Cologne, and Leverkusen as well as cities in the Netherlands including Roermond, Maastricht, and Sittard and in Belgium including Eupen and Liège. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of earthquakes in Germany」の詳細全文を読む スポンサード リンク
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