1989 LOMA PRIETA EARTHQUAKE
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The 1994 Northridge Earthquake occurred at 4:30:55 AM PST on January 17, 1994. It was measured as a magnitude 6.7 on the Richter scale. This quake occurred along the Northridge Thrust, a fault that is also known as the Pico Thrust. It was centered about 20 miles northwest of Los Angeles and approximately 1 mile southûsouthwest of Northridge. This quake was a blind thrust type quake. This particular fault dips to the south at an almost 45 degree angle. As a result, quakes along this fault and similar thrust faults falsely appear far removed from the surface trace. This particular fault forms the ridge slightly to the south of its trace, paralleled by the Santa Clara River and California Sate Highway 126. It begins near the town of Piru in the east and ends just southeast of the city of Ventura. It actually continues offshore to a point about 20 miles south of Santa Barbara. Because this fault is sometimes seen to appear overthrust by the Santa Susana fault, it is labeled as a blind thrust fault. It belongs to the Oak Ridge fault system. It is also known as the Pico thrust, a label it has received as a result of the Pico Anticline, a geologic fold the fault is creating. The quake deformed ground surface around the Los Angeles urban region by increasing elevation of the ground at points as much as 20 inches. The horizontal position of the fault changed by about 8 inches. The focal depth of this quake measured 11.19 miles, similar dept
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Approximate Word count = 899
Approximate Pages = 4 (250 words per page)
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