Temperature changes in an artesian spring at Usami in the Izu Peninsula (Japan) and their relation to earthquakes
1989; Elsevier BV; Volume: 159; Issue: 1-2 Linguagem: Inglês
10.1016/0040-1951(89)90172-8
ISSN1879-3266
AutoresK. Mogi, Hiromine Mochizuki, Yuri Kurokawa,
Tópico(s)earthquake and tectonic studies
ResumoTemperature measurements over quite a long period (since 1976) at an artesian spring at Usami Hot Springs, which is located on the northeastern coast of the Izu Peninsula (Japan) where there has been considerable seismic activity recently, have revealed that the temperature of this hot spring varies in close relation to the occurrence of earthquakes and volcanic eruptions in this region. The highly accurate measurements that have been carried out continuously since 1982 show the nature of temperature changes in this artesian spring at normal times. Based on this, an examination of the long-term temperature change curve produced the following results: (1) normally, the temperature of this artesian spring falls slowly in a more or less linear manner: (2) at the time of a strong earthquake the temperature jumps suddenly in a step pattern; (3) both the long- and short-term precursory changes in temperature have been observed before large shallow earthquakes that have occurred relatively near to the well. This paper also considers the mechanism behind these temperature changes.
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