It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
originally posted by: ANNED
WOW WHAT A RIDE 7.1 mag is something else
I live in Ridgecrest and my motor home went down off the hydraulic jacks and now is setting on its tires.
i hope this one was the main shock not just another for shock
originally posted by: MamaJ
a reply to: violet
Do you think the 5.4 is a big aftershock for a 6.4 mainshock?
originally posted by: TheRedneck
Can someone in the know help me?
I'm trying to analyze the forces in these quakes. Looking at the fault lines in that area, what I am seeing is a primary (my word) fault running mostly east-west (then turning more southward toward LA), but at Ridgecrest it forks, with several secondary (my word) faults running northward at about a right angle to the primary fault. Is that correct?
A magnitude 7.1 earthquake occurred 17km (10.6 miles) NNE of Ridgecrest, California at a depth of 17 km (10.6 miles). The earthquake was felt as far north as San Jose and as far south as Mexico. This earthquake follows a magnitude 6.4 Thursday that we can now define as a foreshock.
The Advanced Rapid Imaging and Analysis (ARIA) team at NASA's Jet Propulsion Laboratory and California Institute of Technology — both in Pasadena, California — created this co-seismic Interferometric Synthetic Aperture Radar (InSAR) map that shows surface displacement caused by the recent major earthquakes in Southern California, including the magnitude 6.4 and the magnitude 7.1 events on July 4 and July 5, 2019, respectively.
The interferogram is derived from synthetic aperture radar (SAR) images from the ALOS-2 satellite, operated by the Japan Aerospace Exploration Agency (JAXA). The images were taken before (April 16, 2018) and after (July 8, 2019) the sequence of earthquakes. Each color cycle represents 4.8 inches (12 centimeters) of ground displacement in the radar line-of-sight.
The image covers an area of 31 by 78 miles (50 by 125 kilometers), and each pixel measures about 98 yards (90 meters) across. No filter was applied during the processing. The linear features across which the color fringes break indicate likely locations of surface rupture caused by the earthquakes, and the "noisy" areas may indicate locations where ground surface was disturbed by the earthquakes.
The Advanced Rapid Imaging and Analysis (ARIA) team at NASA's Jet Propulsion Laboratory in Pasadena, California, created this map of the Ridgecrest area of Southern California following two strong earthquakes — a magnitude 6.4 on July 4 and a magnitude 7.1 on July 5, 2019. The map shows how much and in what direction the ground moved in various places, displayed in meters.
The blue tones show that the ground west of the main fault rupture, which runs from the lower right to the upper left, moved toward the northwest by as much as 0.8 meters (2.7 feet) during the 7.1-magnitude quake. The ground in the red and pink areas moved southeast by as much as 0.6 meters (2 feet). Black lines show faults that were mapped before the 2019 earthquakes.
The 6.4-magnitude quake moved a shorter fault that runs perpendicular to the main fault — shown slightly down and to the left of center on the map. The colors in this area show that the north side of the fault moved to the west (blue) and the south side moved to the east (pink). The green circles correspond to aftershocks of a magnitude of 3.0 or higher, which were detected along both faults, between July 4 and July 9. The larger the circle, the stronger the aftershock.
The ARIA team used interferometric synthetic aperture radar (InSAR) analysis of data from the ALOS-2 satellite, operated by the Japan Aerospace Exploration Agency (JAXA) to create the map. They used images captured before the quakes (on April 16, 2018) and after the quakes (on July 8, 2019) for this analysis
Hope these help.
InSAR (Interferometric Synthetic Aperture Radar) is a technique for mapping ground deformation using radar images of the Earth's surface that are collected from orbiting satellites. Unlike visible or infrared light, radar waves penetrate most weather clouds and are equally effective in darkness. So with InSAR it is possible to track ground deformation even in bad weather and at night – two big advantages during a volcanic crisis.
Two radar images of the same area that were collected at different times from similar vantage points in space can be compared against each other. Any movement of the ground surface toward or away from the satellite can be measured and portrayed as a "picture" – not of the surface itself but of how much the surface moved (deformed) during the time between images.