Article thumbnail
Location of Repository

SEISMIC OBSERVATION AT THE VOLCANO SAKURAJIMA (4) (On the classificajon of volcanic micro-earthquakes and frequency distribution of each types.)

By 圭三 吉川 and 潔 西

Abstract

Micro-earthquakes appered to have their origins near the crater of Sakurajima are classifiedinto 4 types by their dominant period or their duration of the vibration.SP type is one whose dominant period is about 0.1 sec. Or less, BS type about 0.2 sec.And B type about 0.3 sec. Which is observed high frequently. D' type has a long duration ofvibration, which is accompanied with the gas emission.Examining the relation between the frequency distributions of each type and the eruptionin the active stage from the latter part of Oct. to the beginning of Nov. in 19(3, the followingrelations are found.SP type goes on increasing of its frequency till the most violent explosion and after thendecreased.The number of BS type suddenly increased in two or three days before the explosion, anddecreased in the time of being eruptionB type is numerous in all stage, and D' type increased to some extent after the violentexplosion.Micro-earthquakes appered to have their origins near the crater of Sakurajima are classifiedinto 4 types by their dominant period or their duration of the vibration.SP type is one whose dominant period is about 0.1 sec. Or less, BS type about 0.2 sec.And B type about 0.3 sec. Which is observed high frequently. D' type has a long duration ofvibration, which is accompanied with the gas emission.Examining the relation between the frequency distributions of each type and the eruptionin the active stage from the latter part of Oct. to the beginning of Nov. in 19(3, the followingrelations are found.SP type goes on increasing of its frequency till the most violent explosion and after thendecreased.The number of BS type suddenly increased in two or three days before the explosion, anddecreased in the time of being eruptionB type is numerous in all stage, and D' type increased to some extent after the violentexplosion

Topics: 453.5
Publisher: Disaster Prevention Research Institute Kyoto University
Year: 1965
OAI identifier: oai:repository.kulib.kyoto-u.ac.jp:2433/69239
Journal:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://www.dpri.kyoto-u.ac.jp/... (external link)
  • http://hdl.handle.net/2433/692... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.