A doughnut-shaped pattern of seismic activity preceding the Shimane earthquake of 1978


AN earthquake occurred inland at shallow depth in Shimane, southwestern Japan (Fig. 1), on 3 June 1978 GMT. Its seismic magnitude was estimated as 6.1 by the Japan Meteorological Agency (JMA), which was larger than the body wave magnitude of 5.1 estimated by the US Geological Survey, (USGS). Some damage to construction was caused in the epicentral region. We show here that the doughnut-shaped active area and seismicity gap in its centre immediately preceding the earthquake indicated its region and likely magnitude.

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YAMASHINA, K., INOUE, Y. A doughnut-shaped pattern of seismic activity preceding the Shimane earthquake of 1978. Nature 278, 48–50 (1979). https://doi.org/10.1038/278048a0

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