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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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Earthquake History of California 273SACRAMENTOEl+vSANFRANCISCO '""),' 7"x-mI i7-Figure 3. Earthquakes of M > 6, 1907-1984. The areas damaged (MM intensity VIIor greater) are outlined. Earthquakes not damaging a definable area are indicated bya square at <strong>the</strong> epicenter. The earthquakes are numbered chronologically according toTable 1.damaging over large areas. Before 1907 such events were incompletely reported,but large earthquakes which damaged large areas occurred more frequently thanafter 1907.By superimposing Figures 1-3, <strong>the</strong> outline of all <strong>the</strong> areas damaged is shown inFigure 4. This shows that since 1800 <strong>the</strong> seismic hazard has been highest near <strong>the</strong>San Andreas fault zone and <strong>the</strong> Sierra Nevada fault zone.

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