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Earthquake, Sunday, October 23, 2011 at 10:41:21 UTC, Latitude 38.63°N,Longitude 43.49°E, 7.2, Depth 20 km (USGS).

The science coordinator for this event is Prof. Semih Ergintav of Tubitak MRC Earth and Marine Sciences Institute, Istanbul. If you have data or results that you would like to post on this webpage, please e-mail Falk Amelung, the Task Leader of GEO's Supersite initiative (famelung@rsmas.miami.edu) or Susanna Gross (supersites@unavco.org).

Sections
SAR, Visible, GPS, Strain , Earthquakes, Links


Welcome to GEO's Van (eastern Turkey) Event Website

Data Source availability

Revisions

New on Tuesday November 5:       JPL source model

New on Tuesday January 10:       GFZ TSX time-series

New on Monday December 5:       INGV-OV Envisat interferogram

New on Wednesday November 30:       GFZ TSX interferogram

New on Wednesday November 22:       INGV-OV Envisat interferogram
      GFZ Envisat interferogram

New on Tuesday November 15:       GFZ TSX interferogram

New on Monday November 14:       ITU report

New on Friday November 11:       CORS GPS archive

New on Thursday November 10:       GPS displacement file

New on Sunday November 6:       UDIM aftershock animation
      Miami Envisat interferogram

New on Friday November 4:       METU Field Report
      INGV Envisat interferogram       ARIA CSK interferogram

New on Thursday November 3:       ARIA Envisat interferogram
      IREA Envisat interferogram       CGPS displacement       MTA report link

New on Wednesday November 2:       SIGRIS source report

New on Tuesday November 1:       IREA ASAR interferogram

New on Sunday October 30:       ARIA COSMO interferogram

New on Friday October 28:       INGV COSMO interferogram
      ARIA COSMO displacement map

New on Thursday October 27:       KOERI intensity and damage report
      KOERI report on losses       regional focal mechanisms

New on Wednesday October 26:       ATAG event summary
      ATAG aftershock focal mechanisms       TUBITAK aftershock map
      TUBITAK waveforms

New on Tuesday October 25:       Envisat archive data
      USGS source model       AFAD aftershock map
      historical seismicity map

New on Monday October 24:       USGS shakemap

  

SAR
Envisat most recent
Mar 25 2012
ERS No data available
ALOS No data available
TerraSAR-X most recent
Jan 30 2012
Radarsat-1 No data available
Radarsat-2 No data available
Cosmo No data available
Seismic
Short-period Bogaziçi Univ.
Long-period Bogaziçi Univ.
Broad-band Bogaziçi Univ.
Geodetic
Continuous GPS CORS data
Campaign GPS station map
Strainmeter No data available
Tilt No data available
Others
Gas No data available
gravity No data available
Lidar No data available


Instrumental intensity from the USGS (estimated):


SAR, Visible, GPS, Strain, Earthquakes, Links

SAR Data

Natural Laboratory ESA SAR Data for Download index of Van event SAR data for download

ENVISAT:

It would be very helpful if the following ASAR images could be acquired in I6 mode, polarization HH, with level 0 (raw) processing:
tracks 394 and 1221, frames 2817-2853
track 344, frames 729-765
track 71, frames 729-783
track 229, frames 765-783

The more frequently the above images are acquired, the more we can learn about the post-seismic strain field.


Unwrapped phase of the 2011/10/31-2011/11/30 ASAR-ENVISAT InSAR pair (Postseismic, Track 121, IS6, Descending). The fringes close to the epicentral area, on the west side of the Ercek Lake are likely noteworthy. Data processing was carried out at the Istituto Nazionale di Geofisica e Vulcanologia, the "Osservatorio Vesuviano" Naples branch (INGV-OV), Italy, by Sven Borgstrom and Valeria Siniscalchi, with Envisat raw data provided by the European Space Agency (ESA) in the frame of the Supersites initiative. Results obtained with ROI_PAC 3.0.1 from JPL, with orbits from the ESA DORIS web service (preliminary orbits for the Nov. 30, 2011 acquisition). The red star is the epicenter of the M7.2 Van earthquake of October 23, 2011


Unwrapped phase of the 2010/11/05-2011/10/31 (track 121, IS6, descending, right) and the 2011/07/22-2011/11/19 (track 394, IS6, descending, left) ASAR-Envisat InSAR pairs. Data processing was carried out at the Istituto Nazionale di Geofisica e Vulcanologia, the "Osservatorio Vesuviano" Naples branch (INGV-OV), Italy, by Sven Borgstrom and Valeria Siniscalchi with Envisat raw data provided by the European Space Agency (ESA) in the frame of the Supersites initiative. Results obtained with ROI_PAC 3.0.1 from JPL, with orbits from the ESA DORIS web service (preliminary orbits for the Oct. 31, 2011 and Nov. 19, 2011 acquisitions). The red star is the epicenter of the M7.2 Van earthquake of October 23, 2011


Coseismic Envisat interferogram of the combined descending tracks, 121 and 394. The images have been acquired on 2010/11/05 and 2011/10/31, 2011/07/22 and 2011/11/19 respectively. Processing was done by Hannes Bathke within the framework of the PROGRESS project at GFZ Potsdam, using the softwares ROI_Pac and Doris. Envisat data has been provided through the Supersite. An image in a high resolution and a .kml file is available ( here ).


Envisat ASAR interferogram showing coseismic displacement due to the Van Earthquake. This interferogram was generated using two images acquired from the descending orbit ,Track 121, on 2010/11/05 and 2011/10/31 provided by ESA. The DOR orbit was used to process the 2010 image and POR orbit for 2011 acquisition. The baseline was reestimated during the processing. ROI_PAC was used to process this interferogram. Each fringe shows 2.8 cm of displacement in the line of sight direction. Processed by Heresh Fattahi and Fernando Greene at InSAR-Lab, University of Miami.


Unwrapped phase of the 2010/11/05-2011/10/31 ASAR-Envisat InSAR pair (track 121, IM Swath6, Descending Orbits). Data processing was carried out by Sven Borgstrom and Valeria Siniscalchi at the Istituto Nazionale di Geofisica e Vulcanologia, the "Osservatorio Vesuviano" Naples branch (INGV-OV), Italy, with Envisat raw data provided by the European Space Agency (ESA) in the frame of the Supersites initiative. Results obtained with ROI_PAC 3.0.1 from JPL, with orbits from the ESA DORIS web service (preliminary orbits for the Oct. 31, 2011 acquisition). The red star is the location of the M7.2 Van earthquake of October 23, 2011.


Envisat interferometric (InSAR) map of coseismic displacements in the radar line-of-sight (LOS, 41 degrees from vertical and roughly west). Derived from Envisat ASAR (beam IS6, descending track 121) data acquired on 2010/11/05 and 2011/10/31. Precise POR orbits from ESA were used for data processing, and one color cycle represents 2.8 cm of LOS displacements. Processed by Sang-Ho Yun of the ARIA project at JPL-Caltech, using ROI_PAC. The seismicity plot is from USGS Latest Earthquakes. Envisat original data (c) 2011 ESA, provided through this Supersite. Google Earth .kmz file available here.


ENVISAT differential interferogram derived from the scenes acquired on 05/10/2010 and 31/10/2011, along descending orbits (Swath: IS6, Track: 121); one color cycle corresponds to about 2.8 cm displacement in the radar line of site. The interferogram has been produced at IREA-CNR (Napoli, Italy) by using the preliminary ENVISAT orbit products. ENVISAT raw data have been provided by the European Space Agency. KMZ file


ENVISAT differential interferogram derived from the scenes acquired on 05/10/2010 and 31/10/2011, along descending orbits (Swath: IS6, Track: 121); one color cycle corresponds to about 2.8 cm displacement in the radar line of sight. The interferogram has been produced at IREA-CNR (Napoli, Italy) by using the satellite predicted orbits. ENVISAT raw data provided by the European Space Agency.

TerraSAR-X:

Post-earthquake TerraSAR-X observations have been planned by the Charter. The Supersites will acquire additional imagery in the following months to resolve rapid post-seismic deformation. To download TerraSAR-X, please see this simple index


Preliminary time-series analysis of postseismic deformation following the Van earthquake using TerraSAR-X data. The negative values in the time-series plot correspond to line-of-sight (LOS) subsidence while the positive values correspond to LOS uplift. The interferometric processing was done by DORIS software, developed by the Delft Institute for Earth-Oriented Space Research (DEOS), Delft University of Technology, and the time-series analysis was performed using the Small Baseline approach implemented in Stamps software (http://radar.tudelft.nl/~ahooper/stamps/index.html)


Mahdi Motagh of GFZ Potsdam made a TerraSAR-X interferogram using images obtained November 9-20, 2011. The fringes over Van city should be related to the big aftershock of Mw 5.6, November 09, 2011 earthquake. Each color cycle corresponds to 1.5 cm of displacement in the radar line-of-sight (LOS) direction. This interferogram is also available as a geocoded TIFF and a KML file.


Mahdi Motagh of GFZ Potsdam made a TerraSAR-X interferogram using images acquired on 20111029 and 20111109. Each fringe represents 1.5 cm of displacement in the line-of-sight (LOS) direction of the satellite. This interferogram is also available as a geocoded TIFF and a KML file.

COSMO-SkyMed:

Cosmo-SkyMed: At this time this sensor is not available for scientific use by the Supersites community.


COSMO-SkyMed (CSK) interferogram (InSAR) rewrapped with 20 cm color contours showing displacements in the radar line-of-sight (28 degrees from vertical and roughly west). Derived from CSK scenes acquired 2011/10/10 and 2011/10/26, processed from the raw data. Processed by Eric Fielding for the JPL-Caltech ARIA project at the NASA Jet Propulsion Laboratory and for the NASA Earth Surface and Interior Focus Area. COSMO-SkyMed original data are copyright 2011 Italian Space Agency (ASI) and were provided under the ASI CSK AO PI project 2271. Google Earth .kmz file available here.


COSMO-SkyMed (CSK) unwrapped interferogram (InSAR) map of displacements in the radar line-of-sight (28 degrees from vertical and roughly west). Derived from CSK scenes acquired 2011/10/10 and 2011/10/26. Color scale +/-0.8 m with negative range change meaning up and east (towards satellite). Processed by Eric Fielding of the JPL-Caltech ARIA project. COSMO-SkyMed original data are copyright 2011 Italian Space Agency (ASI) and were provided under the ASI CSK AO PI project 2271. Google Earth .kmz file available here.


COSMO-SkyMed (CSK) SAR pixel offsets (sub-pixel correlation) map of displacements in the radar line-of-sight (28 degrees from vertical and roughly west). Derived from CSK scenes acquired 2011/10/10 and 2011/10/26. Color wrap 1.5 m. Processed by Eric Fielding of the JPL-Caltech ARIA project. COSMO-SkyMed original data are copyright 2011 Italian Space Agency (ASI) and were provided under the ASI CSK AO PI project 2271. Google Earth .kmz file available here.


Preliminary differential interferogram from COSMO-SkyMed data (October 10 - October 23, 2011). COSMO data have been provided in the framework of SAFER FP7 Project. Interferogram prepared by Salvatore Stramondo of Istituto Nazionale di Geofisica e Vulcanologia.


Unwrapped phase from COSMO-SkyMed data (October 10 - October 23, 2011). COSMO-SkyMed data have been provided in the framework of SAFER FP7 Project.

SAR, Visible, GPS, Strain , Earthquakes, Links

Visible/Infrared Images


SAR, Visible, GPS, Strain, Earthquakes, Links

GPS Data

UNAVCO's GPS data archive interface for this earthquake.

Two months of GPS data will be made available, before and after the earthquake. You can download the data using the CORS GPS archive clickable map or a simple index.


Coseismic displacement field, based on Turkish CGPS network: TUSAGA-AKTIF. Basically, the CORS stations can constrain the fault strike (between MORA and OZAL and through TVAN) - consistent with the InSAR and focal mechanism. Figure contributed by Semih Ergintav of the Earth and Marine Sciences Institute Gebze, Kocaeli, TURKEY. This first version of the coseismic field was calculated by Dr. Rahsan Cakmak (TUBITAK MRC EMSI).


SAR, Visible, GPS, Strain, Earthquakes, Links

Strain


SAR, Visible, GPS, Strain, Earthquakes, Links

Earthquake Data

    Ground Motion

    Seismicity


    Dr. M. Nurcan Ozel of B. U. Kandilli Observatory and Earthquake Research Institute has written a Google Map animation of aftershocks, to illustrate the release of seismic energy in the region. Click on the static image above to visit the dynamic page.


    The previous earthquake solutions (from Tan, O., 2004. PhD thesis). Black: Tan (2004); Gray: Harvard-CMT; Orange: Orgulu et al., 2003 (GRL), Blue: Taymaz, 1997 (TUBITAK report no YBAG-100). Stars show the historical earthquakes.


    This map of aftershocks with the mainshock focal mechanism was prepared by Onur Tan (TUBITAK, MAM).


    This map of aftershocks with larger focal mechanisms was prepared by the Aktif Tektonik Arastirma Grubu.


    Stuart Wier prepared this map of historical seismicity using the IRIS Earthquake Browser. The most recent event shown is from 10 October 2011. Purple quakes have depths <= 33 km, all others deeper.


    Sinan Akciz and Jascha Polet provided figures showing mainshock and aftershock locations from Bogaziçi University, Kandilli Observatory and Earthquake Research Institute and the Disaster and Emergency Management Presidency in Turkey.

    IRIS

    Seismic Source

    Views of estimated most probable fault geometry and slip distribution from geodetic data inversion. Color shows slip magnitude and arrows show direction of motion of hanging wall on each fault patch. Easting and northing are local coordinates relative to latitude 38.5° and longitude 43.5°; large blue circle, mainshock location from the USGS National Earthquake Information Center; small cyan circles, locations of aftershocks with magnitudes greater than 3 from the KOERI catalog (KOERI-UDIM, 2012). (a) Map view of fault patches projected to surface. (b) Fault normal view of hanging wall (looking roughly south) showing fault-slip distribution in cross section with 1:1 vertical scale. Aftershocks with fixed depths have been removed from this view. (adapted from Fielding et al., 2013.) Fielding, E. J., Lundgren, P. R., Taymaz, T., Yolsal-Çevikbilen, S. and Owen, S. E. (2013). Fault-Slip Source Models for the 2011 M 7.1 Van Earthquake in Turkey from SAR Interferometry, Pixel Offset Tracking, GPS, and Seismic Waveform Analysis. Seismological Research Letters, 84, 579-593.
    SIGRIS report on Co-seismic ground displacement and preliminary source models, by S. Atzori, C. Tolomei, S. Salvi and S. Zoffoli.


    This fit of the mainshock focal mechanism to waveforms was prepared by Onur Tan (TUBITAK, MAM).



    Finite fault Model by Gavin Hayes, USGS NEIC. The figures above show slip on one of the two possible nodal planes and a fit to body waves.


    US Geological Survey


    The Global Centroid-Moment-Tensor (CMT) Project


SAR, Visible, GPS, Strain , Earthquakes, Links

Reports

Links

               

               

         

         

         

           

           

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