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January 13 th , 2007

January 13 th , 2007. Kuril Island (Japan) earthquake (M=8.3) registered in Walferdange, Luxembourg using a gPhone gravity meter and a superconducting gravity meter. Data and plots provided by Prof. O. Francis. Earthquake Location. USGS Earthquake details. Magnitude 8.1 (Great)

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January 13 th , 2007

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  1. January 13th, 2007 Kuril Island (Japan)earthquake (M=8.3) registered in Walferdange, Luxembourg using a gPhone gravity meter and a superconducting gravity meter Data and plots provided by Prof. O. Francis

  2. Earthquake Location

  3. USGS Earthquake details Magnitude 8.1 (Great) # Date-Time Saturday, January 13, 2007 at 04:23:20 (UTC) = Coordinated Universal Time # Saturday, January 13, 2007 at 2:23:20 PM = local time at epicenter Time of Earthquake in other Time Zones Location 46.272°N, 154.455°E Depth 10 km (6.2 miles) set by location program Region EAST OF THE KURIL ISLANDS Distances 505 km (315 miles) SSW of Severo-Kuril'sk, Kuril Islands, Russia 525 km (325 miles) ENE of Kuril'sk, Kuril Islands 1710 km (1060 miles) NE of TOKYO, Japan 7260 km (4510 miles) NE of MOSCOW, Russia Location Uncertainty horizontal +/- 4.7 km (2.9 miles); depth fixed by location program Parameters Nst=241, Nph=241, Dmin=810 km, Rmss=0.92 sec, Gp= 29°, M-type=moment magnitude (Mw), Version=Q Source USGS NEIC (WDCS-D) Event ID us2007xmae

  4. Next slide Superconducting gravimeter gPhone gravimeter

  5. Three and ½ hours after initial registration of earthquake Two meters have good correlation

  6. Overlap of SG and gPhone Frequency Spectrum (Low frequencies) Frequency (Hz) Period (min) 67 33 17 11 8.3 6.7

  7. Conclusions • Large gravity variations caused by an earthquake were simultaneously registered by two different types of gravity meters in Walferdange, Luxembourg • Significant activity is visible even 24 hours after the first shock • Good correlation between different types of gravimeters is observed

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