Ancient and Medieval Events and Recurrence Interval of Great Kanto Earthquakes along the Sagami Trough, Central Japan, as Inferred from Historiographical Seismology

2020 ◽  
Vol 91 (5) ◽  
pp. 2579-2589 ◽  
Author(s):  
Katsuhiko Ishibashi
Keyword(s):  
Fifteenth Century ◽  
Historical Records ◽  
Interplate Earthquake ◽  
Severe Damage ◽  
Sagami Bay ◽  
Aftershock Activity ◽  
Central Japan ◽  
Sagami Trough ◽  
Kanto Earthquake ◽  
Kanto District

Abstract To know the Ancient and Medieval events and the recurrence interval of the great Kanto earthquakes such as the 1923 and 1703 ones generated by the subduction of the Philippine Sea plate along the Sagami trough, central Japan, I examined the latest dataset of historical records. I used only rank-A (contemporary) materials in the Online Database of Historical Documents on Japanese Earthquakes and Eruptions in the Ancient and Medieval Ages. Among destructive earthquakes in the Kanto district before the sixteenth century, the 878 Gangyo earthquake, which has been suspected an inland event generated from the Isehara fault, is considered the oldest candidate of the Kanto earthquake based on the large-scale disaster and intense aftershock activity, though tsunami is not mentioned. The 1293 Showo (Einin) Kamakura earthquake can be regarded as a great Kanto earthquake, because of severe damage in the Kanto district and remarkable aftershock activity. During the fifteenth century, both of the 1433 Eikyo and the 1495 Meio earthquakes are regarded as candidates of the Kanto earthquake; the former caused severe damage around Kamakura on the northern coast of Sagami Bay with high-aftershock activity and presumably caused tsunami, and the latter seems to have caused large tsunamis at Kamakura and the west coast of Sagami Bay. Although further investigation is necessary to clarify which one is the Kanto earthquake, we can say that an interplate earthquake probably occurred in the fifteenth century. Intervals between successive events, in 878, 1293, 1433 or 1495, 1703, and 1923, range from 140 to 270 yr except for the first interval of 415 yr. It is very difficult to confirm whether a great interplate earthquake occurred or not during this interval by means of historiographical seismology, because the Kanto district was in the worst situation of poor historical records in those days.

A Discussion on the measurement and interpretation of changes of strain in the Earth - Earthquake fault studies in Japan

1973 ◽  
Vol 274 (1239) ◽  
pp. 287-296 ◽  
Keyword(s):  
Current Status ◽  
Low Velocity ◽  
Sagami Bay ◽  
Earthquake Fault ◽  
Kanto Earthquake ◽  
The Pacific ◽  
Stress Transmission ◽  
Kanto District ◽  
Complex Monitoring ◽  
Global Tectonics

The paper reviews the current status of earthquake fault studies in Japan, taking the work on the off-Honshu tectonics as an example. Within the Japanese tectonic provinces, the belt along the Pacific coast of central and western Honshu is of special interest from the viewpoints of earthquake prediction as well as of global tectonics. Observations in this field are being made most extensively in the south Kanto district as represented by a complex monitoring system surrounding the Sagami Bay. Complemental use of geophysical instruments with geodetic surveys is successful. The basic mode of strain accumulation thus observed seems consistent with the Sagami trough fault model as proposed by Kanamori and Ando in 1971 to explain the focal processes of the great Kanto earthquake of 1923. Comparison of tiltmeter records at the adjacent stations Aburatsubo and Nokogiriyama suggests crustal strains migrating at an extremely low velocity (20 km/ year, apparently), from east to west (Yamada 1972). Nakamura and Kanamori have shown that correlation of the activities of this fault with those of the Oshima volcano and seismicity in the Kii Peninsula, as seen in old records, provides notable evidence for the mechanism of stress transmission in a tectonic unit.

scholarly journals Visual Observation of the Outcrop at the North Wall of the Tokyo Submarine Canyon in Sagami Bay, Central Japan using the ROV HYPER-DOLPHIN

2015 ◽  
Vol 121 (5) ◽  
pp. 161-166
Author(s):  
Shin'ichi Mori ◽  
Naoki Takahashi ◽  
Kenichiro Shibata ◽  
Yuichiro Tanaka ◽  
Daiji Hirata ◽  
...  
Keyword(s):  
Submarine Canyon ◽  
Visual Observation ◽  
Sagami Bay ◽  
Central Japan ◽  
The North ◽  
North Wall

Pre- and Post-Tsunami Depth Changes of Submarine Topography for the Analysis of Submarine Landslide-Induced Tsunami: Proposal of Digitization Method and Application to the Case of the 1923 Great Kanto Earthquake Tsunamis

2021 ◽  
Author(s):  
Kazuki Murata ◽  
Shinji Sassa ◽  
Tomohiro Takagawa ◽  
Toshikazu Ebisuzaki ◽  
Shigenori Maruyama
Keyword(s):  
Large Scale ◽  
Interpolation Method ◽  
Weighted Average ◽  
Tokyo Bay ◽  
Submarine Landslides ◽  
Sagami Bay ◽  
Seabed Topography ◽  
Kanto Earthquake ◽  
Before And After ◽  
Tsunami Event

Abstract We first propose and examine a method for digitizing analog data of submarine topography by focusing on the seafloor survey records available in the literature to facilitate a detailed analysis of submarine landslides and landslide-induced tsunamis. Second, we apply this digitization method to the seafloor topographic changes recorded before and after the 1923 Great Kanto earthquake tsunami event and evaluate its effectiveness. Third, we discuss the coseismic large-scale seafloor deformation at the Sagami Bay and the mouth of the Tokyo Bay, Japan. The results confirmed that the latitude / longitude and water depth values recorded by the lead sounding measurement method can be approximately extracted from the sea depth coordinates by triangulation survey through the overlaying of the currently available GIS map data without geometric correction such as affine transformation. Further, this proposed method allows us to obtain mesh data of depth changes in the sea area by using the interpolation method based on the IDW (Inverse Distance Weighted) average method through its application to the case of the 1923 Great Kanto Earthquake. Finally, we analyzed and compared the submarine topography before and after the 1923 tsunami event and the current seabed topography. Consequently, we found that these large-scale depth changes correspond to the valley lines that flow down as the topography of the Sagami Bay and the Tokyo Bay mouth.

Pelagic chaetognaths in Sagami Bay and Suruga Bay, Central Japan

1973 ◽  
Vol 29 (6) ◽  
pp. 267-275 ◽  
Author(s):  
Ryuzo Marumo ◽  
Sachiko Nagasawa
Keyword(s):  
Suruga Bay ◽  
Sagami Bay ◽  
Central Japan

scholarly journals Geologic ages and magnetic fabrics of deep-sea sediments in the Sagami Trough, central Japan

2016 ◽  
Vol 23 (0) ◽  
pp. 12-26
Author(s):  
Kiichiro Kawamura ◽  
Masayuki Oishi ◽  
Masanobu Shishikura ◽  
Saneatsu Saito ◽  
Masafumi Murayama ◽  
...  
Keyword(s):  
Deep Sea ◽  
Central Japan ◽  
Sagami Trough ◽  
Magnetic Fabrics ◽  
Deep Sea Sediments

A new deep-sea species of the caridean genus Bresilia Calman, 1896 (Crustacea: Decapoda: Bresiliidae) from Sagami Bay, central Japan

Zootaxa ◽  
2017 ◽  
Vol 4299 (3) ◽  
pp. 405
Author(s):  
TOMOYUKI KOMAI ◽  
HISANORI KOHTSUKA
Keyword(s):  
New Species ◽  
Shallow Water ◽  
Deep Sea ◽  
Ovigerous Female ◽  
Ventral Surface ◽  
Ryukyu Islands ◽  
Female Specimen ◽  
Sagami Bay ◽  
Central Japan ◽  
A New Species

A new species of the rare caridean genus Bresilia Calman, 1896, B. cinctus, is described and illustrated on the basis of a single ovigerous female specimen collected from Sagami Bay, central Japan, at 218–318 m depth. The new species is morphologically most similar to B. rufioculus Komai & Yamada, 2011, known only from shallow water cave of Ie Island (depths 14–17 m), Okinawa Islands, Ryukyu Islands, but many characters, including the proportionally shorter rostrum, the well developed suborbital lobe of the carapace, and the presence of a spiniform seta on the ventral surface of the pereopod 1 palm, immediately distinguish the new species from B. rufioculus. Bresilia cinctus n. sp. is the first species of the genus known from the Japanese main islands. The discovery of the new species led us to reassess the merit of the informal division of Bresilia proposed by Komai & Yamada (2010). An identification key to the ten named species of Bresilia is presented. 

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