Gravity survey around Lake Biwa, southwest Japan.

Nishida, Jun‐ichi; Katsura, Ikuo; Nishimura, Susumu

doi:10.4294/jpe1952.38.1

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…It is known that negative gravity anomalies in the Osaka Bay area can be explained by sediments accumulated in and around Osaka Bay (e.g., [39,40]), and these negative gravities are divided by some active faults (Figure 1). In contrast, it is known that negative gravity anomalies in the Lake Biwa area can not be explained by the distribution of soft sediments in the lake (e.g., [41]). Nishida et al [41] have suggested that depression of the Conrad surface or the existence of very low-density materials due to faulting is necessary to explain the gravity low reaching -60 mGal.…”

Section: Characteristics Of Gravity Anomalymentioning

confidence: 95%

“…In contrast, it is known that negative gravity anomalies in the Lake Biwa area can not be explained by the distribution of soft sediments in the lake (e.g., [41]). Nishida et al [41] have suggested that depression of the Conrad surface or the existence of very low-density materials due to faulting is necessary to explain the gravity low reaching -60 mGal. Figure 6 depicts the first order horizontal derivative of the Bouguer gravity anomalies larger than 2 mGal/km that is shown by color gradation with an interval of 1 mGal/km.…”

Section: Characteristics Of Gravity Anomalymentioning

confidence: 95%

See 1 more Smart Citation

Neotectonic Intra-Arc Basins Within Southwest Japan — Conspicuous Basin-Forming Process Related to Differential Motion of Crustal Blocks

Itoh¹,

Takemura²,

Kusumoto³

2013

Mechanism of Sedimentary Basin Formation - Multidisciplinary Approach on Active Plate Margins

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Section: Characteristics Of Gravity Anomalymentioning

confidence: 95%

Section: Characteristics Of Gravity Anomalymentioning

confidence: 95%

Neotectonic Intra-Arc Basins Within Southwest Japan — Conspicuous Basin-Forming Process Related to Differential Motion of Crustal Blocks

Itoh¹,

Takemura²,

Kusumoto³

2013

Mechanism of Sedimentary Basin Formation - Multidisciplinary Approach on Active Plate Margins

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“…3 ). A large negative gravity anomaly of -60 mGal was measured around Lake Biwa, indicating a thin crustal layer under the lake or the presence of low-density materials due to faults 34 . This area of the lake bottom not only has many faults but has also been subjected to large earthquakes (> M7.0) every 400–500 years 35 .…”

Section: Geologic History Of Lake Biwamentioning

confidence: 98%

Increasing benthic vent formation: a threat to Japan’s ancient lake

Kumagai

Robarts²,

Aota

2021

Sci Rep

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An autonomous underwater vehicle (AUV) was deployed in Lake Biwa from 2000 to 2012. In December 2009, ebullition of turbid water was first found in the deepest area (> 90 m) of the North Basin. Follow-up investigations in April and December 2010 and January 2012 confirmed the existence of benthic vents similar to the vents observed in other deep lakes. Importantly, vent numbers per unit travel distance in Lake Biwa dramatically increased from only two vents (0.37 vents km−1) in December 2009 to 54 vents (5.28 vents km−1) in January 2012, which could be related to recent tectonic activity in Japan, e.g., the M9.1 Tohoku earthquake in March 2011 and slow earthquakes along the Nankai Trough from 2006 to 2018. Continuous back-up investigations from 2014 to 2019 revealed additional benthic vents in the same area. The sudden increase in benthic vent activity (liquid and gaseous ebullitions) have significant potential to alter lake biogeochemistry and, ultimately, degrade Japan’s major drinking water source and may be a harbinger of major crustal change in the near future.

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“…These negative gravities are divided by some active faults. In contrast, negative gravity anomalies in the Lake Biwa area are known to be unexplainable using the distribution of soft sediments in the lake (e.g., [24]). Nishida et al [24] reported that depression of the Conrad surface or existence of very low density materials because of faulting is necessary to explain the gravity lows reaching -60 mGal.…”

Section: Active Tectonics and Geophysical Data Related To Present Lakmentioning

confidence: 99%