|
|duration = 45 seconds |magnitude = 5.6 Mw 〔 |intensity = VII (''Very Strong'') |PGA = 0.06 ''g'' |depth = 〔 |location= 〔 |type = Oblique-slip 〔 |countries affected = Oregon United States |casualties = Six injured 〔 |damage = $28 million 〔 }} The 1993 Scotts Mills earthquake, also known as the "Spring break quake", occurred in the U.S. state of Oregon on March 25 at 5:34 AM Pacific Standard Time. With a moment magnitude of 5.6 and a maximum perceived intensity of VII (''Very Strong'') on the Mercalli intensity scale, it was the largest earthquake in the Pacific Northwest since the Elk Lake and Goat Rocks earthquakes of 1981. Ground motion was widely felt in Oregon's Willamette Valley, the Portland metropolitan area, and as far north as the Puget Sound area near Seattle, Washington. ==Earthquake== The Scotts Mills mainshock epicenter was located about east of the town of Scotts Mills in Marion County, and about south of Portland. The United States Geological Survey reported that strong motion instruments recorded peak ground accelerations of 0.06 g at Detroit Dam, to the southeast, and also give an extensive review of damage reports and ground motion intensities. Reports of the earthquake came from as far as Roseburg in southern Oregon, 165 miles south of the epicenter, to the coastal town of Lincoln City, east to Bend, and north to Seattle. The seismology lab from the University of Washington in Seattle reported the Richter magnitude to be 5.4, but stated that the initial figure could change. An aftershock measuring 3.2 happened within the first hour of the main shock.〔 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 Scotts Mills earthquake」の詳細全文を読む スポンサード リンク
|