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Hazards of Geomagnetic Storms
The October 1992 Parkfield California
Earthquakes NovemberDecember 1991
4.7 earthquake A-alert A-level alert a.m. MST alert status Aleutian Andreanof Islands aseismic buildings Colorado counties creepmeter damaging earthquake Earth's magnetic field earthquake hit earthquake prediction earthquake struck earthquake was centered earthquake was felt earthquake was located effects were experienced effects were noted Emergency Services Erzincan experiment foreshock on October geomagnetic field geomagnetic storms hazards hotline hypocenters Idaho Intensity km east km north km southwest Kuril Islands light earthquake occurred located about 60 Magnetic Storm magnitude 4.7 shock magnitude 5.0 earthquake magnitude 6 earthquake mainshock March 13 Middle Mountain minor earthquake occurred moderate earthquake North Anatolian fault northwest November October 20 Office of Emergency Oregon p.m. PST Parkfield Earthquake Photograph public warning quake quake was centered quake was felt quake was located recorded reported felt Richard Andrews San Andreas fault satellites solar wind status levels strong earthquake sunspot tion U.S. Geological Survey USGS zone