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Location and Magnitude from Seismic Intensity Data of Recent and Historic Earthquakes in the Northern Rhine Area, Central Europe

Department of Earthquake Geology
University of Cologne
Vinzenz-Pallotti-Str. 26
D-51429 Bergisch Gladbach, Germany
hinzen{at}uni-koeln.de

By adapting and calibrating Bakun and Wentworth's (1997) solution strategy for seismic intensity observations for the Northern and Middle Rhine Area (NRA), Central Europe, local magnitudes with objective confidence-level uncertainties are estimated for 23 test-set earthquakes that occurred between 1692 and 1963. Analysis of 4375 Medvedev Sponheuer Karnik intensity (MSKI) observations for 14 instrumentally recorded and located training-set events suggests that an intensity magnitude, M_LI, corresponding to local magnitude, M_L, can be determined from the mean of M_LIi = (MSKI_i + 0.7374 + 0.0184 * _i)/1.2673. _i is the distance in km of observation MSKI_i. In a grid of 81 x 51 trial epicenters, 5-km grid-point distance, contours of rms [M_LI], where rms is the root mean square, bound the epicentral region. A total of 3628 intensity observations was used for the test-set earthquakes, seven of which showed M_LI 5.5. The strongest historical events are the Verviers 1692 and the Düren 1756 events with M_LI values of 6.8 and 6.4, respectively.

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