Abstract
Digitally-recorded waveforms from foreshocks and aftershocks of the October 18, 1981, Eniwa, Hokkaido, earthquake (M=4.0)are compared. The foreshock activity exhibits the pattern similar to a main shock-aftershock sequence. Four consecutive foreshocks (M= −0.1 to 1.3) that occurred during one hour and a half before the main shock have strongly similar waveforms. An average value of peak cross-correlations for pairs of foreshock seismograms is 0.86. The bandpass-filtered waveforms are well correlated at frequencies up to at least 20 Hz. This implies similar source mechanisms and tight clustering of hypocenters within a radius of no more than 1/4 wavelength, i.e., 70 m or less. Aftershock waveforms are variable from one event to the next, although at least four groups of similar events are found during the aftershock period. The present exercise provides one approach to the identification of a foreshock sequence on the basis of remarkably similar waveforms.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Bakun, W. H. and T. V. Mcevilly, Are foreshocks distinctive? Evidence from the 1966 Park field and the 1975 Oroville, California sequences, Bull. Seism. Soc. Am., 69, 1027–1038, 1979.
Geller, R. J. and C. S. Mueller, Four similar earthquakes in central California, Geophys. Res. Lett., 7, 821–824, 1980.
Hamaguchi, H. and A. Hasegawa, Recurrent occurrence of the earthquakes with similar wave forms and its related problems, J. Seism. Soc. Japan, 28, 153–169, 1975 (in Japanese).
Hasegawa, A., N. Umino, and A. Takagi, Seismicity patterns before large earthquakes in the northeastern Japan arc, Abstracts of US-Japan Seminar on Practical Approaches to Earthquake Prediction and Warning, Nov. 7–11, Tokyo, 1983.
Ishida, M. and H. Kanamori, The foreshock activity of the 1971 San Fernando earthquake, California, Bull. Seism. Soc. Am., 68, 1265–1279, 1978.
Japan Meteorological Agency, The Seismological Bulletin for October, 1981, 1982.
Lindh, A., G. Flits, and C. Mantis, Seismic amplitude measurements suggest foreshocks have different focal mechanisms than aftershocks, Science, 201, 56–59, 1978.
Masuda, T. and A. Takagi, Source parameter estimates for small earthquakes, Sci. Rep. Tohoku Univ., Ser. 5, Geophys., 25, 39–54, 1978.
Motoya, Y., Seismicity near Sapporo city (1973.7–1980), Rep. Coordinating Committee for Earthq. Prediction, 26, 13, 1981 (in Japanese).
Motoya, Y., Seismic activity before the Urakawa-Oki earthquake of 1982, Proc. Symp. Disaster Sci., 20, 156–159, 1983 (in Japanese).
Motoya, Y., Waveform similarity of twin Petegari earthquakes of October 3, 1981, J. Seism. Soc. Japan, 37, 125–129, 1984 (in Japanese).
Okada, HM., H. Watanabe, H. Yamashita, and I. Yokoyama, Seismological significance of the 1977–1978 eruptions and the magma intrusion process of Usu volcano, Hokkaido, J. Volcano’. Geotherm. Res., 9, 311–334, 1981.
Omori, F., Horizontal pendulum observations of earthquakes in Tokyo: Similarity of the seismic motion originating at neighbouring centres, Publ. Earthq. Inv. Committee in Foreign Languages, No. 21, 9–102, 1905.
Pechmann, J. C. and H. Kanamori, Waveforms and spectra of preshocks and aftershocks of the 1979 Imperial Valley, California, earthquake: Evidence for fault heterogeneity?, J. Geophys. Res., 87, 10579–105 37, 1982.
Saito, M., An automatic design algorithm for band selective recursive digital filters, Butsuri-Tanko (Geophysical Exploration), 31, 240–263, 1978 (in Japanese).
Takeo, M., Source mechanisms of Usu volcano, Japan, earthquakes and their tectonic implications, Phys. Earth Planet. Inter., 32, 241–264, 1983.
Tsujiura, M., Waveform and spectral features of earthquake swarms and foreshocks-in special reference to earthquake prediction, Bull. Earthq. Res. Inst., Univ. Tokyo, 58, 65–134, 1983.
Tsumura, K., I. Karakama, I. Ogino, and M. Takahashi, Seismic activities before and after the Izu-Oshima-Kinkai earthquake, Bull. Earthq. Res. Inst., Univ. Tokyo, 53, 675–706, 1978 (in Japanese).
Utsu, T., Aftershocks and earthquake statistics (II), J. Fac. Sci. Hokkaido Univ. Ser. VII, Geophys., 3, 197–266, 1970.
Wood, H. O., Earthquake study in southern California, Sic. Monthly, Carnegie Institution of Washington, Washington, D.C., 39, 323–344, 1934.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1985 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Motoya, Y., Abe, K. (1985). Waveform Similarity among Foreshocks and Aftershocks of the October 18, 1981, Eniwa, Hokkaido, Earthquake. In: Kisslinger, C., Rikitake, T. (eds) Practical Approaches to Earthquake Prediction and Warning. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2738-9_24
Download citation
DOI: https://doi.org/10.1007/978-94-017-2738-9_24
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-8421-7
Online ISBN: 978-94-017-2738-9
eBook Packages: Springer Book Archive