|
|magnitude = 6.0 Mw |depth = |intensity = VII (''Very Strong'') |location = |countries affected = Southern Oregon Northern California |tsunami = |foreshocks = |aftershocks = |casualties = 2 |damage = $10 million }} The 1993 Klamath Falls earthquakes took place in Klamath Falls, Oregon, beginning on Monday, 20 September at 8:28 p.m. The doublet earthquake registered respective magnitudes of 6.0 and 5.9 on the moment magnitude scale. The earthquakes were located at a depth of and tremors continued to be felt more than three months after the initial shocks. ==Tectonics and previous activity== The tectonic structure of south-central Oregon is riddled with fault lines. The West Klamath Lake fault zone is capable of earthquakes up to Richter magnitude 7.3. The magnitude 5.4 Coos Bay earthquake which preceded a later 2002 Klamath Falls earthquake occurred along the northern segment of the Blanco Fracture Zone, which is separate from the inland Klamath Basin and Range geological province. These fault networks have caused several previous earthquakes in the Klamath Falls area. Records from 1945 indicate approximately fifteen seismic events, prior to the 1993 events, circulating within a radius of Klamath Falls. However, of those observed during the preceding fifty years, only six were considered significant.〔〔 Previously most tremors measured less than 4 Mw with the strongest being 4.3 Mw in 1948.〔 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「1993 Klamath Falls earthquakes」の詳細全文を読む スポンサード リンク
|