Turbidites as records of intense palaeoearthquakes in Lake Biwa, Japan

Yoshio Inouchi; Yoshihiro Kinugasa; Fujio Kumon; Satoshi Nakano; Sadao Yasumatsu; Tsunemasa Shiki

Turbidites as records of intense palaeoearthquakes in Lake Biwa, Japan

Yoshio Inouchi^*, Yoshihiro Kinugasa, Fujio Kumon, Satoshi Nakano, Sadao Yasumatsu, Tsunemasa Shiki

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

66 Citations (Scopus)

Abstract

Some 20 turbidites were collected in the uppermost 3 m of surface sediments in Lake Biwa, southwest Japan. These turbidites correlate in age to historical earthquakes that caused severe loss of lives and property near Lake Biwa. The age of each turbidite was estimated precisely, based on sedimentation rate (by weight) and the age of tephra markers below the turbidites. The magnitudes and epicentres of major historical earthquakes during the last 1300 years are available from historical documents. Empirical equations relating intensity, distance to the epicentre and magnitude enable us to calculate the ground shaking at Lake Biwa from these historical earthquakes. Earthquakes having intensity stronger than grade IV_L on the Japan Meteorological Agency (JMA) earthquake scale, that is 44 gal acceleration at Lake Biwa, all coincide with the turbidite ages. This intensity is apparently the lower threshold for turbidity-current initiation in Lake Biwa.

Original language	English
Pages (from-to)	117-125
Number of pages	9
Journal	Sedimentary Geology
Volume	104
Issue number	1-4
Publication status	Published - 1996 Jul
Externally published	Yes

ASJC Scopus subject areas

Geology
Stratigraphy

Cite this

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title = "Turbidites as records of intense palaeoearthquakes in Lake Biwa, Japan",

abstract = "Some 20 turbidites were collected in the uppermost 3 m of surface sediments in Lake Biwa, southwest Japan. These turbidites correlate in age to historical earthquakes that caused severe loss of lives and property near Lake Biwa. The age of each turbidite was estimated precisely, based on sedimentation rate (by weight) and the age of tephra markers below the turbidites. The magnitudes and epicentres of major historical earthquakes during the last 1300 years are available from historical documents. Empirical equations relating intensity, distance to the epicentre and magnitude enable us to calculate the ground shaking at Lake Biwa from these historical earthquakes. Earthquakes having intensity stronger than grade IVL on the Japan Meteorological Agency (JMA) earthquake scale, that is 44 gal acceleration at Lake Biwa, all coincide with the turbidite ages. This intensity is apparently the lower threshold for turbidity-current initiation in Lake Biwa.",

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T1 - Turbidites as records of intense palaeoearthquakes in Lake Biwa, Japan

AU - Inouchi, Yoshio

AU - Kinugasa, Yoshihiro

AU - Kumon, Fujio

AU - Nakano, Satoshi

AU - Yasumatsu, Sadao

AU - Shiki, Tsunemasa

PY - 1996/7

Y1 - 1996/7

N2 - Some 20 turbidites were collected in the uppermost 3 m of surface sediments in Lake Biwa, southwest Japan. These turbidites correlate in age to historical earthquakes that caused severe loss of lives and property near Lake Biwa. The age of each turbidite was estimated precisely, based on sedimentation rate (by weight) and the age of tephra markers below the turbidites. The magnitudes and epicentres of major historical earthquakes during the last 1300 years are available from historical documents. Empirical equations relating intensity, distance to the epicentre and magnitude enable us to calculate the ground shaking at Lake Biwa from these historical earthquakes. Earthquakes having intensity stronger than grade IVL on the Japan Meteorological Agency (JMA) earthquake scale, that is 44 gal acceleration at Lake Biwa, all coincide with the turbidite ages. This intensity is apparently the lower threshold for turbidity-current initiation in Lake Biwa.

AB - Some 20 turbidites were collected in the uppermost 3 m of surface sediments in Lake Biwa, southwest Japan. These turbidites correlate in age to historical earthquakes that caused severe loss of lives and property near Lake Biwa. The age of each turbidite was estimated precisely, based on sedimentation rate (by weight) and the age of tephra markers below the turbidites. The magnitudes and epicentres of major historical earthquakes during the last 1300 years are available from historical documents. Empirical equations relating intensity, distance to the epicentre and magnitude enable us to calculate the ground shaking at Lake Biwa from these historical earthquakes. Earthquakes having intensity stronger than grade IVL on the Japan Meteorological Agency (JMA) earthquake scale, that is 44 gal acceleration at Lake Biwa, all coincide with the turbidite ages. This intensity is apparently the lower threshold for turbidity-current initiation in Lake Biwa.

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Turbidites as records of intense palaeoearthquakes in Lake Biwa, Japan

Abstract

ASJC Scopus subject areas

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