Data and Models of 1999 Izmit and Düzce Earthquakes

August 17, 1999 Izmit Earthquake

• Izmit coseismic GPS data (Reilinger et al., 2000):
• izmit_0229.3Dgmtvec Station coordinates and 3D displacements used in the inversion
  N, E and Up displacements and their 1-sigma uncertainties
• obs.gmtvec Station coordinates and horizontal displacements for plotting in GMT.
  East, North, East sigma, North sigma, orientation of the major axis of the error ellipse.
  In GMT, plot with :
  psvelo obs.gmtvec -J${projection} -R${range} -A0.058/0.15/0.09 - Sr0.70/0.95/0 -K -O -G000/000/000 -W2/000/000/000 -L -V >> ${psfile}
• Izmit coseismic slip model (Reilinger et al., 2000):
• FaultGeom_59by7_cos Geometry of the fault grid elements.
  width - Depth - Dip - lat/lon start - lat/lon end - strike-slip - dip-slip - opening
  These also indicate the sequence in which the slip values are arranged (59 elements from W to E, row by row from top to bottom)
• strike_slip.txt Slip values (m) of each element and estimated standard deviation.
• mod.gmtvec Horizontal model displacements
  Plot with :
  psvelo mod.gmtvec -J${projection} -R${range} -A0.024/0.10/0.06 -Sr0.70/0.95/0 -K -O -G255/255/000 -W2/000/000/000 -L -V >> ${psfile}
• mod_vert.gmtvec Vertical model displacements
  Plot with :
  psvelo mod_vert.gmtvec -J${projection} -R${range} -A0.080/0.00/0.05 -Sr2.00/0.95/0 -K -O -G255/255/255 -W2/000/000/000 -L -V >> ${psfile}
  All the model displacements are relative to the last site in the original data file, in this case ANKR located at 39.8873749 N, 32.7584692 E.
• Izmit postseismic GPS data (Reilinger et al., 2000): To be posted
• Izmit postseismic slip model (Reilinger et al., 2000):
• FaultGeom_55by10_40km_post Geometry of the postseismic fault grid elements.
  width - Depth - Dip - lat/lon start - lat/lon end - strike-slip - dip-slip - opening
  These also indicate the sequence in which the slip values are arranged (55 elements from W to E, row by row from top to bottom, which is 40 km)
• strike_slip_75days.txt Postseismic slip values (m) of each element during the first 75 days and estimated standard deviation.

Reilinger, R.E., S. Ergintav, R. Bürgmann, S. McClusky, O. Lenk, A. Barka, O. Gurkan, L. Hearn, K. L. Feigl, R. Cakmak, B. Aktug, H. Ozener, M.N. Töksoz, Coseismic and postseismic fault slip for the 17 August 1999, M=7.5, Izmit, Turkey Earthquake Science , 289, 1519-1524, 2000.   (View online) (Supplementary published material. Includes coseismic GPS displacements, postseismic GPS displacements and model resolution tests)

Please contact Kurt Feigl for the models and data presented in:
Feigl, K.L., Sarti, F., Vadon, H., McClusky, S., Ergintav, S., Durand, P., Bürgmann, R., Rigo, A., Massonnet, D., and Reilinger, R. , Estimating slip distribution for the Izmit mainshock from coseismic GPS and INSAR measurements, Bull. Seismol. Soc. Am., 92, 138-160, 2002.   (Download PDF version)

Postseismic Deformation Following the August 17, 1999 Izmit Earthquake

Click here to view the movie in .mpg format.

• FaultGeom_NIF Geometry of the 6 fault segments (reaching to 50 km depth) used in the time-dependent, distributed slip models. Each segment is further divided into 7 horizontal and 12 vertical elements for a total of 504 patches.
  width - Depth - Dip - lat/lon start - lat/lon end - strike-slip - dip-slip - opening
• cumulative_slip_history.txt 87 days (columns) of cumulative slip on the 504 fault patches (rows).

Bürgmann, R., S. Ergintav, P. Segall, E.H. Hearn, S. McClusky, R.E. Reilinger, H. Woith, and J. Zschau, Time-space Variable Afterslip on and Deep Below the Izmit Earthquake Rupture, Bull. Seismol. Soc. Am., 92, 126-137, 2002.   (Download PDF version)

Please contact Semih Ergintav and Liz Hearn for the data and models presented in:
Ergintav, S., R. Bürgmann, S. McClusky, L. Hearn, R.E. Reilinger, B. A., H. Meteris, B. Aktuk, O. Gurkan, H. Ozener, R. Cakmak, and N. Yalcin, Postseismic deformation following Izmit Earthquake, 17 August 1999, Bull. Seismol. Soc. Am., 92, 194-207, 2002.   (Download PDF version)

Hearn, E.H., R. Bürgmann, and R. Reilinger, Dynamics of Izmit Earthquake Postseismic Deformation and Loading of the Düzce Earthquake Hypocenter, Bull. Seismol. Soc. Am., 92, 172-193, 2002.   (Download PDF version)

November 12, 1999 Düzce Earthquake

• Düzce coseismic GPS data (Bürgmann et al., 2002):
• duzce_cos_GPS_corrected.gmt 3D displacements used in the inversion
  N, E and Up displacements and their 1-sigma uncertainties.
  Actual GPS observations spanning varying time intervals were corrected using parameters specified in Table 1 of Bürgmann et al. (2002).
• obs.gmtvec Horizontal displacements computed from this model for plotting in GMT.
• duzce_INSAR.dat InSAR range changes.
  Lon, Lat, range change, and projection of unit range change vector onto E, N and Up components for each sub-sampled point.
• duzce_INSAR_corrected.dat InSAR range changes.
  Same as previous file, but corrected using parameters specified in Table 1 of Bürgmann et al. (2002).
  In GMT, plot using:
  awk '{print $1,$2,-1*$3}' duzce_INSAR_corrected.dat | \
psxy -J${projection} -R${range} -Csar_color.cpt -N -Sc0.09 -P -K -O -V >> ${psfile}
psscale -B:"range change (m):" -Csar_color.cpt -D4.3/0.70/2.20/0.15h -L -O -K >> ${psfile}
• Düzce coseismic Models (Bürgmann et al., 2002):
• Corrections.txt Summary and some additional information of model corrections for non-coseismic deformation provided in Table 1 of Bürgmann et al. (2002)
• Duzce_models.READMESimple one and two-fault models presented in Table 2 of (Bürgmann et al., 2002), as well as a few additional results using different weights (uncertainties) for the InSAR data.

Ayhan, M. E., Bürgmann, R., McClusky, S., Lenk, O., Aktug, B., Herece, E., and Reilinger, R.E, Kinematics of the Mw 7.2, 12 November 1999, Düzce, Turkey earthquake, Geophys. Res. Lett., 28, 367-370, 2001. (Download PDF version)

Bürgmann, R., M.A. Ayhan, E.J. Fielding, T. Wright, S. McClusky, B. Aktug, C. Demir, O. Lenk, and A. Türkezer, Deformation during the 12 November 1999, Düzce, Turkey Earthquake, from GPS and InSAR Data, Bull. Seismol. Soc. Am., 92, 161-171, 2002.   (Download PDF version)

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