Abstract
The term « swarm » is used to describe a group of related earthquakes, concentrated in space and time, without an obvious principal event. Large shallow earthquakes are often followed by aftershocks, but the pattern in which aftershocks occur differs in detail from that of a swarm.
Sequences of New Zealand earthquakes that have been called swarms differ markedly from one another. The most vigorous of them, near Taupo in 1922, appears to have been an ordinary tectonic earthquake accompanied by foreshocks and aftershocks, and by surface faulting. No fault movements accompanied the 1964 swarm in the same area. Other localities that have experienced swarms include Great Barrier Island, Matamata, Kawerau, and Opunake.
Swarms are considered by some writers to be characteristic of volcanic regions. Although all New Zealand swarms have occurred in areas of Quaternary volcanism, there are still no observations showing what part, if any, volcanism plays in the generation of earthquake swarms.
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References
Bullen, K. E., 1963 —An Introduction to the Theory of Seismology. Cambridge Univ. Press, 3rd ed. 381 pp.
Credner, H., 1900 —Die vogtländischen Erdbebenschwärme während des Juli und August 1900. Sitzber. Nov. 1900. Math.-Phys. Kl. d.kgl. Sachs. Ges. der Wissenshaft zu Leipzig.
Etzold, F., 1919 —Die sächsischen Erdbeben während der Jahre 1907–1915. Abh. Math.-Phys. Kl. d.kgl. Sachs. Ges. der Wissenschaft zu Leipzig.
Grange, L. I., 1932 —Rents and Faults formed during Earthquake of 1922 in Taupo District. N.Z.J. Sci. and Tech.,14, pp. 139–141.
Knopoff, L., 1964 —The Statistics of Earthquakes in Southern California. Bull. Seismol. Soc. America,54, (6), pp. 1871–3.
Matuzawa, T., 1964 —Study of Earthquakes. Uno Shoten, Tokyo, 213 pp.
Morgan, P. G., 1923 — N.Z. Geol. Survey. 17th Ann. Report, Parliamentary Paper C-2C, pp. 10–11, 1923.
Richter, C. F., 1958 —Elementary Seismology. W. M. Freeman and Co., San Francisco, 768 pp.
Sieberg, A., 1923 —Geologische, physikalische, und angewandte Erdbebenkunde. Gustav Fischer, Jena, 572 pp.
Vere-Jones, D., Turnovsky, S, andEiby, G. A., 1964 —A Statistical Study of Earthquakes in the Main Seismic Region of New Zealand. N.Z.J. Geol. and Geophys.,7, (4), pp. 722–44.
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Paper read at the IAV International Symposium on Volcanology (New Zealand), scientific session of Nov. 24, 1965.
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Eiby, G.A. Earthquake swarms and volcanism in New Zealand. Bull Volcanol 29, 61–73 (1966). https://doi.org/10.1007/BF02597142
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DOI: https://doi.org/10.1007/BF02597142