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Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

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Figure 3. Variation of <strong>the</strong> number of earthquakes per year, 1885-1984. Top: Shallow earthquakes of M 2 6 and M 2 7(h < 100 km) in region A (region enclosed by solid lines in Figure 2). Circles represent <strong>the</strong> magnitude of <strong>the</strong> largestearthquake in each year. Center: Deep earthquakes of M 2 6 (h 2 100 km) in region A. Data before 1900 are not shown.Bottom: Earthquakes which caused damage in Japan. Triangles indicate <strong>the</strong> time of earthquakes which killed more than 200persons. High rates around 1966 are mostly due to <strong>the</strong> Matsushiro swarm.

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