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Data, Movement on Hector EQ!!
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Posted by Jeanine on November 25, 1999 at 01:20:51:
Hi All, I haven't left yet , This was just sent to me. Thought all would like to see this.... Copy and Paste, Shot cut time..... > MEDIA RELATIONS OFFICE > JET PROPULSION LABORATORY > CALIFORNIA INSTITUTE OF TECHNOLOGY > NATIONAL AERONAUTICS AND SPACE ADMINISTRATION > PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011 > http://www.jpl.nasa.gov > > Image Advisory November 24, 1999 > > RADAR SNAPSHOTS REVEAL QUAKE MOVEMENT IN SHARP DETAIL > > New spaceborne radar data of California's October 16 7.1 > magnitude earthquake near the desert town of Twentynine Palms > show ground movement with millimeter precision four days after > the temblor. > > The new radar measurements combine two images taken by the > European Space Agency's European Remote Sensing-2 satellite on > September 15, about one month before the quake, and October 20, > four days after the quake. Overall, the image shows a complex > pattern of displacements that provides new insights into the > mechanisms of the earthquake, which fractured the region's Lavic > Lake fault. Scientists refer to the event as the Hector Mine > earthquake. > > The images are available at http://www.jpl.nasa.gov/hectormine . > > Each color is a contour of measurable ground displacement > and the amount of displacement between successive contours of the > same color is 10 centimeters (4 inches). Taken from space at a > 23-degree angle, the contours can be counted to indicate that the > ground moved as much as 5 meters (17 feet) near the fault. > > The technique of combining images from spaceborne radar > instruments to discern elevation and surface change is called > synthetic aperture radar interferometry. This scientific tool is > quickly becoming a standard method for studying active tectonics > and other natural processes both on Earth and on other planets > and moons. Synthetic aperture radar interferometry allows > seismologists and geophysicists to study regions of a planet with > unprecedented precision and resolution over days, months and > years, and to monitor processes such as volcanoes, glacier flows > and landslides. > > The European Remote Sensing-2 satellite is managed by the > European Space Agency headquartered in Paris, France. Radar > analysis was carried out by JPL's imaging radar group for NASA's > Earth Science Enterprise, Washington, DC. JPL is a division of > the California Institute of Technology, Pasadena, CA. > > ##### > --------------------------------------------------------------- > You are subscribed to JPL's news mailing list. To unsubscribe, > please send an e-mail to JPLNews@jpl.nasa.gov and in the body > of the message include the following line. > > unsubscribe news > > Please do not reply to this e-mail. > For help, send a message to listmaster@www.jpl.nasa.gov. > Have a Happy turkey day!!! :-) Jeanine
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