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Science 26 January 2007:
Vol. 315. no. 5811, p. 433
DOI: 10.1126/science.315.5811.433c
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This Week in Science
Japan installed seismic networks on the Nankai subduction zone after the Kobe earthquake, and the resulting measurements have revealed a wealth of new phenomena, including nonvolcanic tremor, long-period volcanic events, and slow earthquakes. Ito et al. (p. 503, published online 30 November; see the Perspective by Dragert) identify yet another type of seismic reverberation, that of very-low-frequency events with equivalent magnitudes of 3 to 3.5 and long periods of tens of seconds. The very-low-frequency earthquakes accompany and migrate with nonvolcanic tremor and slow slip events. The coincidence of these three phenomena improves the detection and characterization of slow earthquakes, which are thought to increase the stress on the updip megathrust earthquake rupture zone.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
