California: More than 70 earthquakes have shaken the Pacific coastal State since late Thursday
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Pastor Dale Morgan
Jul 16, 2011, 4:08:19 PM7/16/11
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Earthquakes In Diverse Places
California: More than 70 earthquakes have shaken the Pacific coastal State since late Thursday
Posted By Mark Dunphy On July 16, 2011 @ 1:50 PM
San Francisco
Earthquakes are a common occurrence in California but the past few days have seen a notable rise in the number of tremors recorded in the US State.
More than 70 earthquakes [2] have shaken the Pacific coastal State since late Thursday, the latest being a magnitude 3.3 tremor in the San Francisco Bay area on Saturday morning.
The shallow quake struck at a depth of just 6.4 km (4.0 miles) at 03:51 AM local time (11:51 A.M. GMT). According to the United States Geological Survey (USGS [3]) the quake epicentre was located 2 km (2 miles) ESE (115°) from Berkeley, 4 km (3 miles) NE (47°) from Emeryville, 5 km (3 miles) NNW (340°) from Piedmont, and 8 km (5 miles) NNW (345°) from Oakland.
Over the past 48 hours earth tremors have been felt throughout the state, including the Greater Los Angeles area, San Diego and the San Francisco Bay area. The majority of the earthquakes ranged between 2-4 magnitude. Other areas to experience earth tremors include Los Banos, Holtville, Parkfield, Pinnacles, Johnville, Valle Vista, La Jolla, Anderson Springs, Cloverdale, Cobb, Hawthorns, Anza, The Geysers, Mettler, San Carlos, Hemet and Keene.
Meanwhile, a magnitude 4.0 earthquake struck near Baja California’s (Mexico) border with Arizona (USA) early on Friday. The quake was located 36 km (22 miles) S (180°) from Guadalupe Victoria, Baja California; 63 km (39 miles) SSW (210°) from San Luis Roo Colorado, Sonora, Mexico; 67 km (41 miles) SSW (209°) from San Luis, Arizona; and 190 km (118 miles) ESE (109°) from Tijuana, Baja California.
The shallow earth tremor struck at 11.37 a.m. GMT (3.37 a.m. local time) at a depth of approximately 7 km (4.3 miles), reports the USGS. The quake was followed by a 3.6 magnitude tremor in the early hours of Saturday morning.
Baja California also is located along the San Andreas Fault.
SEISMIC ACTIVITY IN CALIFORNIA
Earthquakes in California [4] are common occurrences as the state is located on the San Andreas Fault, which traverses across California and forms the tectonic boundary between the Pacific and the North American Plate. There are thousands of small earthquakes per year, most of them are so small that they are not felt. However, scores of earthquakes in the 2-4 magnitude range have been recorded in the past few days.
California has hundreds of active faults located throughout the state that are capable of producing large earthquakes. The most active fault is the San Jacinto Fault in Southern California, which has produced large events on a regular basis throughout recent history. The Mendocino Triple Junction located offshore of Northern California is also very active, producing several earthquakes above magnitude 7 throughout history.
EARTHQUAKE SWARMS
Earthquake swarms [5] are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time. The length of time used to define the swarm itself varies, but the United States Geological Survey (USGS [6]) points out that an event may be on the order of days, weeks, or months. They are differentiated from earthquakes succeeded by a series of aftershocks by the observation that no single earthquake in the sequence is obviously the main shock. Earthquake swarms also are one of the events typically preceding eruptions of volcanoes.
California: More than 70 earthquakes have shaken the Pacific coastal State since late Thursday
Posted By Mark Dunphy On July 16, 2011 @ 1:50 PM
San Francisco
Earthquakes are a common occurrence in California but the past few days have seen a notable rise in the number of tremors recorded in the US State.
More than 70 earthquakes [2] have shaken the Pacific coastal State since late Thursday, the latest being a magnitude 3.3 tremor in the San Francisco Bay area on Saturday morning.
The shallow quake struck at a depth of just 6.4 km (4.0 miles) at 03:51 AM local time (11:51 A.M. GMT). According to the United States Geological Survey (USGS [3]) the quake epicentre was located 2 km (2 miles) ESE (115°) from Berkeley, 4 km (3 miles) NE (47°) from Emeryville, 5 km (3 miles) NNW (340°) from Piedmont, and 8 km (5 miles) NNW (345°) from Oakland.
Over the past 48 hours earth tremors have been felt throughout the state, including the Greater Los Angeles area, San Diego and the San Francisco Bay area. The majority of the earthquakes ranged between 2-4 magnitude. Other areas to experience earth tremors include Los Banos, Holtville, Parkfield, Pinnacles, Johnville, Valle Vista, La Jolla, Anderson Springs, Cloverdale, Cobb, Hawthorns, Anza, The Geysers, Mettler, San Carlos, Hemet and Keene.
Meanwhile, a magnitude 4.0 earthquake struck near Baja California’s (Mexico) border with Arizona (USA) early on Friday. The quake was located 36 km (22 miles) S (180°) from Guadalupe Victoria, Baja California; 63 km (39 miles) SSW (210°) from San Luis Roo Colorado, Sonora, Mexico; 67 km (41 miles) SSW (209°) from San Luis, Arizona; and 190 km (118 miles) ESE (109°) from Tijuana, Baja California.
The shallow earth tremor struck at 11.37 a.m. GMT (3.37 a.m. local time) at a depth of approximately 7 km (4.3 miles), reports the USGS. The quake was followed by a 3.6 magnitude tremor in the early hours of Saturday morning.
Baja California also is located along the San Andreas Fault.
SEISMIC ACTIVITY IN CALIFORNIA
Earthquakes in California [4] are common occurrences as the state is located on the San Andreas Fault, which traverses across California and forms the tectonic boundary between the Pacific and the North American Plate. There are thousands of small earthquakes per year, most of them are so small that they are not felt. However, scores of earthquakes in the 2-4 magnitude range have been recorded in the past few days.
California has hundreds of active faults located throughout the state that are capable of producing large earthquakes. The most active fault is the San Jacinto Fault in Southern California, which has produced large events on a regular basis throughout recent history. The Mendocino Triple Junction located offshore of Northern California is also very active, producing several earthquakes above magnitude 7 throughout history.
EARTHQUAKE SWARMS
Earthquake swarms [5] are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time. The length of time used to define the swarm itself varies, but the United States Geological Survey (USGS [6]) points out that an event may be on the order of days, weeks, or months. They are differentiated from earthquakes succeeded by a series of aftershocks by the observation that no single earthquake in the sequence is obviously the main shock. Earthquake swarms also are one of the events typically preceding eruptions of volcanoes.
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