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Study of the electrical field Study of the electrical field related to Kozani Kozani- -Grevena Grevena related to (Greece) Ms 6.6 earthquake of (Greece) Ms 6.6 earthquake of May 13, 1995 May 13, 1995 Preliminary results Preliminary

  1. Study of the electrical field Study of the electrical field related to Kozani Kozani- -Grevena Grevena related to (Greece) Ms 6.6 earthquake of (Greece) Ms 6.6 earthquake of May 13, 1995 May 13, 1995 Preliminary results Preliminary results Vargemezis G. Geophysical Laboratory of Aristotle’s University of Thessaloniki, GREECE Zlotnicki J. CNRS-UPB-UMR6524, FRANCE 1

  2. • Case description- Motivation • Data collection • Mass data processing • Focusing in special cases • Conclusions 2

  3. May 13, 1995 earthquake in Kozani area, Greece 3

  4. Model of 1995 KOZANI-GREVENA sequence • Mw 6.6 • Strike N65 o E • Length 30km • Width 10km • Dip NNW • Mean displacement 50cm • Depth 13.6km Papazachos et al. (1998) Papanastasiou et al. (1998) 4

  5. Resor et al. (2005) 5

  6. Seismicity in time Number of events 900 Minimum 2.1 Maximum 6.6 6

  7. 7

  8. Telluric stations Installation EANI : 18/5/95 PANAYIA: 21/5/95 KNIDI : 28/5/95 8

  9. Installation of KNIDI telluric station Pb-PbCl 2 Non polarized electrode Sampling interval: 4 sec m 0 5 9

  10. VOLOS remote EM station 10

  11. • Plots of time series of raw data in different time periods • Filtering in different frequencies • Time-space plots of telluric and seismic activity • Plots of polarization variation in time …… Comparison with seismic activity 11

  12. Telluric activity in KNIDI station 9 Jun 19 Jul 28 Aug 7 Oct 12

  13. Telluric field at EANI station 20 May 30 May 9 Jun 19 Jun 29 Jun 9 Jul 19 Jul 29 Jul 8 Aug 18 Aug 28 Aug 13

  14. Telluric field at PANAYIA station 20 May 30 May 9 Jun 19 Jun 29 Jun 9 Jul 19 Jul 29 Jul 8 Aug 18 Aug 28 Aug 14

  15. Telluric activity in KOZANI network 6 5 Mw 4 3 2 30 20 KNIDI 10 0 -10 -20 20 0 EANI -20 -40 -60 -80 100 PANAYIA 0 -100 -200 -300 140 160 180 200 220 20 May 30 May 9 Jun 19 Jun 29 Jun 9 Jul 19 Jul 29 Jul 8 Aug 18 Aug 15

  16. Time-Space distribution of seismic events 16

  17. Telluric activity compared to rainfalls and seismicity 30 Rainfall (mm) 20 10 0 Seismicity Time Interval: 18 May-25 Aug (136-235) Knidi Knidi-Eani 30 Number of events Eani Eani-Panayia Panayia 20 Panayia-Knidi 10 0 31-May 14-Jun 28-Jun 12-Jul 26-Jul 9-Aug 23-Aug 30 20 KNIDI 10 0 -10 -20 20 0 EANI -20 -40 -60 -80 100 PANAYIA 0 -100 -200 -300 140 160 180 200 220 17

  18. Step 1: Raw data observation TIME PERIOD: 148-202, normalized amplitude: mV/km TIME PERIOD: 202-235, normalized amplitude: mV/km 5 227 0 KNI KNI -5 113 -10 -15 -1 -20 EW EW 0 20 PAN -20 PAN 0 -40 -18 -20 EANI -43 167 -68 EW 180 128 EW 163 89 60 V V 146 56 O H O -3 H 3 L L -66 -50 68 67 O O D D 22 17 S S -23 200 -34 173 NS 145 NS 150 90 20 EANI 127 -10 24.0 -40 KNI 26 2.0 KNI 21 -20.0 NS NS 0 16 -70 PAN -100 PAN -139 -200 -300 -208 18 146 153 160 167 174 181 188 195 202 19-Jul 24-Jul 29-Jul 3-Aug 8-Aug 13-Aug 18-Aug 23-Aug

  19. Filtered data TIME PERIOD: 176-202, normalized amplitude: mV/km TIME PERIOD: 176-202, normalized amplitude: mV/km Periods: 1<T<2h Periods: > 4h 1.0 1 KNI KNI 0.1 -5 -0.8 EW -11 EW 2.1 -5 PAN PAN 0.2 -11 -1.7 -17 6 166 EW EW 1 136 -4 106 17 V 57 V O H 2 O H 6 L -13 L -45 11 61 O O D -1 D 15 S S -13 -31 3.5 163 NS NS -0.2 154 -3.9 145 2.2 24 KNI KNI 0.1 14 -2.0 4 NS NS 39 -75 PAN PAN -7 -123 -53 -171 176 181 186 191 196 201 176 183 190 197 19

  20. Step 2: Focusing on shorter periods of data records Period A: 20 May-14 June Period B: 12 -24 July Period C: 12-27 September 20

  21. Period A: 140-165 TIME PERIOD: 140-165, normalized amplitude: mV/km TIME PERIOD: 140-165, Band Pass (1h<T<2h)), mV/km 0.8 KNI 0.4 KNI 0.0 -0.4 -0.8 PAN 0.8 EW 18 0.0 PAN 8 -0.8 14 -2 EAN 1 -8 -12 EANI -29 6 -50 EW 119 1 EW 109 99 -4 17 V V 89 43 O O H 2 H -4 L L -13 -51 10 66 O O D D 16 1 S S -34 152 -8 4.6 NS 138 NS 0.3 124 12 EANI -4.0 -12 7 EAN -36 -1 14 KNI -9 -3 1.0 KNI NS 0.0 -20 -1.0 -1 PAN 0.8 PAN 0.4 -61 0.0 -0.4 -121 -0.8 140 142 144 146 148 150 152 154 156 158 160 162 164 166 140 147 154 161 21

  22. Day 143: EANI station 5 1 2 3 4 5 -10 EW (mV/km) -20 4.3 4.24.1 4.2 -30 4 3.6 -40 20 3 10 NS (mV/km) 0 Mw 3 1 -10 2 2 -20 -30 4 16 5 Rainfall (mm) 12 1 8 4 0 0 143 143.2 143.4 143.6 143.8 144 22

  23. Day 149: KNIDI station 21°25'0"E 21°30'0"E 21°35'0"E 21°40'0"E 21°45'0"E 21°50'0"E 21°55'0"E 22°0'0"E 22°5'0"E Lightings 40°15'0"N 4 40°15'0"N 4 4 4 0.4 4 4 4 3.8 4 4 4 EANI 4 4 40°10'0"N 40°10'0"N 4 4 4 @ 0 5 5 3.6 4 EW (mV/km) 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 4 3.53.4 -0.4 KNIDI 5 5 4 4 4 5 5 40°5'0"N 40°5'0"N 3.2 3.3 @ 5 5 4 4 5 3.2 3.2 -0.8 5 5 . . . . 4 5 4 PANAYIA 5 . . 4 4 3 2.9 3 40°0'0"N 40°0'0"N -1.2 @ 3 2.9 2.9 4 4 4 4 4 4 2.8 4 4 -1.6 4 4 4 4 4 4 4 4 39°55'0"N 4 4 39°55'0"N 2.6 8.5 4 4 4 4 4 39°50'0"N 39°50'0"N 4 8 NS (mV/km) 7.5 Mw 2 21°25'0"E 21°30'0"E 21°35'0"E 21°40'0"E 21°45'0"E 21°50'0"E 21°55'0"E 22°0'0"E 22°5'0"E 7 6.5 Legend 149.291, 2.9 149.3485, 3.6 149.5191, 2.9 149.7514, 3.4 @ 3.4 - 3.6 3.7 - 3.8 T elluric Stations 2.6 2.6 2.6 2.6 6 2.7 - 3.0 2.7 - 3.0 2.7 - 3.0 2.7 - 3.0 149.1577, 3.3 3.7 - 3.8 Seismic Events 3.1 - 3.3 3.1 - 3.3 3.1 - 3.3 3.1 - 3.3 20 2.6 Ms 149.0309, 2.6 2.7 - 3.0 3.4 - 3.6 3.4 - 3.6 3.4 - 3.6 3.4 - 3.6 1 149.0012, 2.9 2.6 3.1 - 3.3 16 2.6 2.7 - 3.0 Rainfall (mm) 3.7 - 3.8 3.7 - 3.8 3.7 - 3.8 3.7 - 3.8 2.7 - 3.0 3.4 - 3.6 3.1 - 3.3 3.1 - 3.3 149.3025, 3 149.4656, 3.2 149.7022, 3.5 149.8391, 3.8 12 3.4 - 3.6 3.7 - 3.8 2.6 2.6 2.6 2.6 3.4 - 3.6 2.7 - 3.0 2.7 - 3.0 2.7 - 3.0 2.7 - 3.0 149.2425, 3 3.7 - 3.8 8 3.1 - 3.3 3.1 - 3.3 3.1 - 3.3 3.1 - 3.3 2.6 3.7 - 3.8 149.0882, 3.2 2.7 - 3.0 3.4 - 3.6 3.4 - 3.6 3.4 - 3.6 3.4 - 3.6 149.0195, 3.2 2.6 3.1 - 3.3 4 2.6 2.7 - 3.0 3.7 - 3.8 3.7 - 3.8 3.7 - 3.8 3.7 - 3.8 2.7 - 3.0 3.4 - 3.6 3.1 - 3.3 3.1 - 3.3 0 0 3.4 - 3.6 3.7 - 3.8 149 149.2 149.4 149.6 149.8 150 23

  24. 21°25'0"E 21°30'0"E 21°35'0"E 21°40'0"E 21°45'0"E 21°50'0"E 21°55'0"E 22°0'0"E 22°5'0"E 40°15'0"N 40°15'0"N 4 Day 157: KNIDI station 4 4 4 4 4 4 4 EANI 4 40°10'0"N 40°10'0"N 4 4 4 @ 5 5 4 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 KNIDI 5 5 4 4 4 4 5 5 40°5'0"N 40°5'0"N @ 5 5 4 5 5 5 2 5 . . 4.8 . . 4 5 4 PANAYIA 5 . . 4 4 40°0'0"N 40°0'0"N 1 @ EW (mV/km) 4 4 4 4 4 4 4 4 4 4 4 4 4 0 4 39°55'0"N 4 39°55'0"N 4 4 4 -1 4 4 4 4 3.8 4 39°50'0"N 39°50'0"N 4 -2 3.7 3.5 -3 21°25'0"E 21°30'0"E 21°35'0"E 21°40'0"E 21°45'0"E 21°50'0"E 21°55'0"E 22°0'0"E 22°5'0"E 12.5 Legend 2.9 3 12 156.7728, 3.8 157.3764, 3.5 @ 3.9 - 4.0 4.4 - 4.5 4.6 - 4.8 4.6 - 4.8 T elluric Stations 3.5 - 3.8 3.5 - 3.8 NS (mV/km) 4.1 - 4.3 157.0325, 3.7 3.9 - 4.0 3.9 - 4.0 4.6 - 4.8 Seismic Events 11.5 Mw 3.5 - 3.8 4.4 - 4.5 Ms 4.1 - 4.3 4.1 - 4.3 157.1917, 4.8 3.9 - 4.0 3.5 - 3.8 4.4 - 4.5 4.6 - 4.8 4.4 - 4.5 11 4.1 - 4.3 0.5 5 4.8 2 10.5 0 EW (mV/km) -0.5 4 3.8 10 3.7 -1 3.5 25 -1.5 2.9 3 -2 20 Rainfall (mm) 11.8 1 Mw 15 11.6 2 9h NS (mV/km) 10 1.6h 11.4 11.2 1 5 11 0 0 10.8 0 156 156.4 156.8 157.2 157.6 158 156.6 156.8 157 157.2 157.4 24

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