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1645 Luzon earthquake
The 1645 Luzon earthquake was one of the most destructive earthquakes to hit the Philippines. It occurred on November 30 at about 08:00 PM local time on Luzon Island in the northern part of the country. The island was struck by a 7.5 Ms (surface wave magnitude) tremor produced by the San Manuel and Gabaldon Faults (Nueva Ecija) in the central section of the island.〔Tsutsumi, H., Daligdig, J.A., Goto, H., Tungol, N.M., Kondo, H., Nakata, T., Okuno, M., and Sugito, N. (2006). Timing of surface-rupturing earthquakes on the Philippine fault zone in central Luzon Island, Philippines. ''EOS Transactions,
American Geophysical Union'' 87, Supplement.〕
Aftershocks continued a few days after the quake then on December 4, 1645, at 11:00 pm, a strong earthquake allegedly equal or stronger than the November 30 shaking hit the same area, causing further death and destruction.
==Extent==
Its meizoseismal area was not less than from north to south, that is, from the southern coast of Batangas and Quezon provinces to Cagayan in the northeasternmost part of the island. On the western coast, it seems to have been of less intensity; at least the chronicles of the time are silent about its effects in these parts. They dealt very much with the destruction caused in Manila and neighboring provinces to the south, east, and north, the tremendous effects produced in the eastern part of the Central Cordillera Mountains, and as far north as in Lal-Lo in the Cagayan Valley where large fissures opened in the earth and many large landslides occurred in the hills.〔Maso, Saderra M (1913). (("Bulletin of the Seismological Society of America, Vols. 3 & 4 - Seismic Disturbances in Manila" ). Seismological Society of America.〕〔Maso, Saderra M. (1904). ("Volcano and Seismic Centers of the Philippine Archipelago" ). pp.73-75. Department of Commerce and Labor.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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