Computational Seismology

sense do not grow as fast as computational possi­ This book contains selections from Volumes bilities. I-V of the series "Computational Seismology," which Moreover, for some strange reason, comput­ was initiated a few years ago by the Academy of ers usually create a spirit of haste, though they are Sciences of the USSR. Volume V was still in prepa­ intended to provide time for meditation. In com­ ration when the translation was begun, and the trans­ puterizing seismology, therefore, one must first lations of papers from it were made from manu­ generalize the methods and then make them more scripts. Most of the authors are members of the rigorous mathematically. All relevant data must Department of Computational Geophysics of the In­ be processed jointly. Insofar as is possible, a priori stitute of Physics of the Earth, Moscow. hypotheses should be avoided. Particular attention The series is dedicated to theoretical and must be given to exact formulation of the problem, computational aspects of the analysis of seismolog­ to questions of uniqueness and stability, to the con­ ical data. The present state of this field is typical fidence limits of the results, etc. This general ap­ of our times. The rapidly increasing flow of infor­ proach is required in solving the main problems of mation is already too vast to be processed or even modern seismology, which are by definition general comprehended in a traditional way. This has forced problems. This approach has other advantages. Front Matter....Pages i-viii Introduction Seismology and Logic....Pages 1-9 Front Matter....Pages 11-11 Computer Determination of Earthquake Epicenters....Pages 13-15 Computer Determination of Earthquake Focal Depth....Pages 16-24 Automatic Identification of Seismic Wave Arrivals....Pages 25-31 Computer Determination of Earthquake Mechanism....Pages 32-45 Front Matter....Pages 47-47 Some Problems of the Use of P-Wave Dynamics to Find the Velocity Profile of the Upper Mantle....Pages 49-53 The Effect of Focal Depth in the Crust on the Wave Field in the Initial Part of a Seismogram....Pages 54-61 Approximation of Velocity Distributions for Calculation of P-Wave Times and Amplitudes....Pages 62-69 Amplitudes of Fundamental Seismic Waves in the Mantle....Pages 70-82 Interference Head Waves....Pages 83-87 Method for Calculating Surface Rayleigh Waves in a Vertically Inhomogeneous Half-Space....Pages 88-92 Higher Modes of Rayleigh Waves and Upper Mantle Structure....Pages 93-100 Surface-Wave Amplitude Spectra....Pages 101-105 Front Matter....Pages 107-107 Inverse Problems of Seismology (Structural Review)....Pages 109-113 Determining Seismic Profiles from a Set of Observations....Pages 114-118 Expediting Body Wave Calculations....Pages 119-122 Determining Seismic-Wave Velocity from Travel-Time Curves....Pages 123-147 Properties of Surface-Source Travel- Time Curves....Pages 148-171 Characteristic Properties of Deep-Focus Travel-Time Curves....Pages 172-178 Finding a Velocity Profile from a Love Wave Dispersion Curve: Problems of Uniqueness....Pages 179-186 Front Matter....Pages 187-187 Effect of Station and Source Factors on the Accuracy of Seismic Parameter Determination....Pages 189-201 A Statistical Method for Determining Earthquake Focal Depth from the Record of One Seismic Station....Pages 202-213 Local Statistics of Earthquake Catalogs....Pages 214-227