SURFACE-WAVE MAGNITUDE CALIBRATION FOR EUROPEAN REGION EARTHQUAKES

Abstract This paper is concerned with the calibration of the surface-wave magnitude scale for the European region using the Prague formula. Two issues in particular have been addressed: ˙Does the Prague formula require a correction of the distance dependency term? ˙Is a source depth correction required? The issue of distance dependency has been investigated by examining the distance dependency of residuals from individual station Msmagnitudes and “representative” Ms magnitude values. We find that Ma magnitudes determined for the European region, using the Prague formula show slight dependence on recording station distance. The subsequent distance dependency of the mean Ma magnitude determination is therefore a function of the distance distribution of the recording stations. The question of depth correction has been investigated by examining the regression of Ms magnitudes versus seismic moment as a function of depth. We find that the Ms magnitudes determined by the Prague formula are only valid for crusta...

[1]  L. Christoskov,et al.  Homogeneous magnitude system of the Eurasian continent : S and L waves , 1983 .

[2]  R. Adams.  Local earthquake quantification , 1982 .

[3]  J. Vaněk.  Comment on “Distance dependence of Ms and calibrating function for 20 second Rayleigh waves” by M. Herak and D. Herak , 1995, Bulletin of the Seismological Society of America.

[4]  N. Ambraseys,et al.  The Seismicity of Egypt, Arabia and the Red Sea , 1994 .

[5]  Göran Ekström,et al.  Evidence of bias in estimations of earthquake size , 1988, Nature.

[6]  C. Richter.  An instrumental earthquake magnitude scale , 1935 .

[7]  G. Panza,et al.  Gutenberg's surface-wave magnitude calibrating function: Theoretical basis from synthetic seismograms , 1989 .

[8]  Vít Kárník,et al.  Seismicity of the European area , 1971 .

[9]  N. Ambraseys,et al.  A history of Persian earthquakes , 1982 .

[10]  J. Evernden.  Variation of rayleigh-wave amplitude with distance , 1971, Bulletin of the Seismological Society of America.

[11]  Analysis of the seismic response of masonry buildings excited by a shaking table , 1994 .

[12]  N. N. Ambraseys,et al.  Magnitude assessment of northwestern european earthquakes , 1985 .

[13]  M. Båth.  Surface-wave magnitude corrections for intermediate and deep earthquakes , 1985 .

[14]  P. Basham.  Canadian Magnitudes of Earthquakes and Nuclear Explosions in South-Western North America , 1969 .

[15]  A. Screpanti,et al.  La magnitudo dei terremoti italiani del XX secolo , 1993 .

[16]  D. V. Seggern.  Amplitude-distance relation for 20-second Rayleigh waves , 1977 .

[17]  O. Nuttli,et al.  Seismic wave attenuation and magnitude relations for eastern North America , 1973 .

[18]  B. Gutenberg,et al.  Amplitudes of surface waves and magnitudes of shallow earthquakes , 1945 .

[19]  Charles F. Richter,et al.  MAGNITUDE AND ENERGY OF EARTHQUAKES , 1936 .

[20]  M. Herak,et al.  Distance dependence of Ms and calibrating function for 20 second Rayleigh waves , 1993, Bulletin of the Seismological Society of America.

[21]  N. N. Ambraseys,et al.  Uniform magnitude re‐evaluation of European earthquakes associated with strong‐motion records , 1990 .

[22]  H. Kanamori,et al.  A moment magnitude scale , 1979 .

[23]  P. D. Marshall,et al.  Rayleigh wave magnitude scaleMs , 1973 .

[24]  G. Panza,et al.  Effect of source depth correction on the estimation of earthquake size , 1995 .