Introduction to seismotectonics of the Japanese Islands

DOI Web Site 2 Citations 34 References

Bibliographic Information

Other Title
  • 地震地質学に関する試論
  • ジシン チシツガク ニ カンスル シロン

Search this article

Description

Recent destructive earthquakes such as the Hyogoken-nanbu earthquake of 1995, the Tottoriken-seibu earthquake of 2000 and the Geiyo earthquake of 2001 took place successively around west Honshu, and we are anxious about the occurrence of the future Nankaido earthquake off Shikoku and the Kii Peninsula, judging from the past mode of occurrence. Levelling survey along the route from Kakogawa to Osaka showed the upheaval of the Rokko Mountains and the block movement to the southwest of the mountains, where heavy casualties took place. Destructive earthquakes occurred around the Chubu Mountains in central Honshu during the active periods from middle 1800s to early 1900s, and from 1920s to 1940s. The intermediate and deep earthquakes occur along the zones running in N-S and NW-SE directions separated by the aseismic zones about 100km in width, and big shallow earthquakes tend to take place on the intermediate and deep earthquake zones. The faults accompanying the intermediate and deep earthquakes are normal under the mountains, suggesting the vertical driving force, and reverse under plains and bays, probably due to the secondary horizontal force from the upheaving mountains. The shallow and intermediate earthquakes take place under the basins of the Uonuma Formation deposited from late Pliocene to late Pleistocene along the Shinano Rever in central Honshu. The faults deduced from the P-wave radiation pattern of intermediate earthquakes are normal, and those of shallow earthquakes are reverse, running parallel to the strikes of the basins. Those activity shows that Niigata Plain following the Uonuma basin is deep-seated. The levelling surveys show the upheaval of the Japanese Islands, and the triangulation surveys indicate the concentration of shear strains around the mountains, where the destructive earthquakes take place. The program of earthquake prediction must be prepared on the geodetic crustal movement and earthquake occurrence of those units, judging from those data.

Journal

Citations (2)*help

See more

References(34)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top