Download flood extent maps at http://aria-share.jpl.nasa.gov/events/20160111-US_Midwest_Floods/
In response to the April 25, 2015 M7.8 Gorkha, Nepal Earthquake, the ARIA project is providing valuable information for the ongoing response to the April 25, 2015 M7.8 Gorkha earthquake in Nepal. The quake has caused significant regional damage and a humanitarian crisis.
Damage Proxy Map
The data products include a Damage Proxy Map, which covers the region around Kathmandu, was processed by the Advanced Rapid Imaging and Analysis (ARIA) team at JPL and Caltech using X-band interferometric synthetic aperture radar data from ASI's COSMO-SkyMed satellite constellation. The technique uses a prototype algorithm to rapidly detect surface changes caused by natural or human-produced damage. The assessment technique is most sensitive to destruction of the built environment. When the radar images areas with little to no destruction, its image pixels are transparent. Increased opacity of the radar image pixels reflects damage, with areas in red reflecting the heaviest damage to cities and towns. The color variations from yellow to red indicate increasingly more significant ground surface change. The time span of the data for the change is Nov. 24, 2014 to April 29, 2015. Each pixel in the damage proxy map is about 100 feet (30 meters) across.
The perspective image (above) shows the DPM overlaid on the terrain with the locations of damaged buildings identified by the National Geospatial-Intelligence Agency (NGA) preliminary damage assessment, indicated by the red and purple dots. As an example, the images on the side show how red regions in the DPM correlate with damaged buildings, as shown by the collapsed structures in the "after" image. The base map images were provided by Google. Before and after images were provided by DigitalGlobe.
Surface Deformation and Fault Slip Model
The ARIA team analyzed interferometric synthetic aperture radar images from the European Union’s Copernicus Sentinel-1A satellite, operated by the European Space Agency and also available from the Alaska Satellite Facility (https://www.asf.alaska.edu), to calculate a map of the deformation of Earth’s surface caused by the quake. This false-color map shows the amount of permanent surface movement caused almost entirely by the earthquake, as viewed by the satellite, during a 12-day interval between two Sentinel-1 images acquired on April 17 and April 29, 2015.
Links to ARIA Data Products and Images:
Damage Proxy Map (kmz): http://aria-share.jpl.nasa.gov/events/20150425-Nepal_EQ/DPM/ARIA_DPM_v0.5u_CSKd_20150430.kmz
GPS Coseismic Offsets (ascii file): http://aria-share.jpl.nasa.gov/events/20150425-Nepal_EQ/GPS/20150425Nepal_ARIA_Rapid_Offsets_v1.txt
GPS Coseismic Offsets (pdf): http://aria-share.jpl.nasa.gov/events/20150425-Nepal_EQ/GPS/20150425Nepal_ARIA_Rapid_Offsets_v1.pdf
In response to the August 24, 2014 M6.0 South Napa Earthquake, the ARIA team has generated coseismic GPS displacements, coseismic InSAR displacements, and a Damage Proxy Map. The above image is an Interferometric Synthetic Aperture Radar (InSAR) map of coseismic displacement (unwrapped interferogram) in the radar line-of-sight (LOS, 29 degrees from vertical and roughly west) caused by the 2014/08/24 M6.0 South Napa Earthquake, California. Derived from COSMO-SkyMed data acquired on 2014/07/26 and 2014/08/27. Processed by ARIA team at JPL-Caltech in collaboration with the Italian Space Agency (ASI) and University of Basilicata. The epicenter indicated with the red star is from USGS NEIC. The blue line indicates the North Bay Aqueduct. COSMO-SkyMed data (c) ASI 2014.
These results have been posted to the California Earthquake Clearinghouse and Southern California Earthquake Center Response Forum. The InSAR displacement maps are being used by field geologist to identify additional surface fault ruptures.
Image files with interferograms can be downloaded from the following links:
- Coseismic InSAR Displacements KMZ file: http://aria-share.jpl.nasa.gov/events/20140824-south_napa/interferogram/ARIA_NapaEQ_CSK_D74_coseis_unw.kmz
- Coseismic InSAR Displacements JPG file: http://aria-share.jpl.nasa.gov/events/20140824-south_napa/interferogram/ARIA_NapaEQ_CSK_D74_coseis_unw.jpg
- Wrapped Interferogram KMZ file:http://aria-share.jpl.nasa.gov/events/20140824-south_napa/interferogram/ARIA_NapaEQ_CSK_D74_coseis_ifg.kmz
- Wrapped Interferogram JPG: http://aria-share.jpl.nasa.gov/events/20140824-south_napa/interferogram/ARIA_NapaEQ_CSK_D74_coseis_ifg.jpg
An Image file with Damage Proxy Map can be downloaded from:
Files with GPS results can be downloaded here:
- Map of Horizontal Displacements: http://aria-share.jpl.nasa.gov/events/20140824-south_napa/gps/20140824_SouthNapa_GPS_Displacements_v2.jpg
- Table with Offset Values: http://aria-share.jpl.nasa.gov/events/20140824-south_napa/gps/20140824_Napa_ARIA_RapidOffsets.v2.txt
ARIA team responded to Hurricane Sandy and manually produced a damage proxy map (DPM) of New York City using X-band radar data from COSMO-SkyMed satellites. The team coordinated a group of GIS experts to validate each pixel of the DPM to remove false positives, comparing with pre-event Google Earth image and post-event NOAA's aerial photographs. The data was acquired on Day 5, the DPM was created on Day 11, and the validated product on Day 15. The product was delivered to the International Charter, and the response report is available online at http://www.giscorps.org/index.php?option=com_content&task=view&id=129&It.... The results demonstrate great potential of InSAR data and future automated system ARIA team is building.
We have done analysis of InSAR, GPS and seismic data for the 2011/10/23 Mw 7.2 earthquake near Van, Turkey to develop models for the fault slip. Publication has recently been accepted for Seismological Research Letters.
Satellite radar derived color contour maps of ground movement due to the January 12, 2010 M7 earthquake in Haiti. Each color cycle corresponds to 11.8 cm of motion. The white star denotes the epicenter location. The red rectangle is the inferred north-dipping fault model at depth, with the solid line being the surface projection of the model.