Historical tsunami and storm deposits during the last five centuries on the Sanriku coast, Japan

Gotō, Tomoko; Satake, Kenji; Sugai, Toshihiko; Ishibe, Takeo; Harada, Tomoya; Murotani, Satoko

doi:10.1016/j.margeo.2015.05.009

Cited by 59 publications

(22 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The study estimated each event age using 137 Cs, excess 210 Pb, and radiocarbon dating. Although Goto et al (2015) identified more events since fifteenth centuries compared to this study, they indicated the occurrence of the 1933, 1896, and 1611 historical tsunami deposits identified in Koyadori. However, there were too many washover deposits in Goto's site, and thus it is considered that they could not distinguish between the tsunami and storm deposits clearly.…”

Section: Radiocarbon Dating and The Modeled Ages Of Tsunami Depositscontrasting

confidence: 70%

“…On the other hand, Goto et al (2015) conducted a paleo-tsunami survey in Miyako, 50 km north from Koyadori, and discovered nine washover deposits interpreted as tsunami and storm deposits since 15 centuries. The study estimated each event age using 137 Cs, excess 210 Pb, and radiocarbon dating.…”

Section: Radiocarbon Dating and The Modeled Ages Of Tsunami Depositsmentioning

confidence: 99%

See 1 more Smart Citation

Re-examination of the age of historical and paleo-tsunami deposits at Koyadori on the Sanriku Coast, Northeast Japan

Ishimura

2017

Geosci. Lett.

View full text Add to dashboard Cite

High-accuracy age estimations of tsunami deposits are very important for tsunami deposit research because the recurrence interval and frequency of tsunami deposits allow us to assess the devastating impacts of tsunamis in a populated country such as Japan. The correlation of tsunami events between remote coastal areas further enables us to constrain tsunami scenarios and fault segmentation along a trench. Before the 2011 Tohoku-oki earthquake, the long-term tsunami history along the Sanriku Coast was not well known. Age data of the long-term tsunami history are essential to understand the mechanisms of tsunami generation and earthquakes and to assess the risks posed by them. This study re-examined the age of historical and paleo-tsunami deposits (E1 to E11 deposits) at Koyadori in the middle of the Sanriku Coast and estimated their ages with high accuracy by using continuous sediments since approximately 4 ka. Radiocarbon dating was conducted in combination with other radiometric dating methods ( 137 Cs and excess 210 Pb) to estimate the ages of the sediments. The resulting ages revealed the reliable ages of ten historical and paleo-tsunami deposits. The average recurrence interval of historical and paleo-tsunamis in the last 4 ka is 350-390 years, and each recurrence interval between the E4 and E11 deposits is similar despite the tsunami deposits having different characteristics. Moreover, far-field tsunamis do not seem to inundate this site based on the observed and documented records. The continuous and long-term data of tsunami deposits at Koyadori offer important constraints on the timing and frequency of near-field earthquakes (e.g., megathrust, outer-rise, and tsunami earthquakes) around the Japan Trench.

show abstract

Section: Radiocarbon Dating and The Modeled Ages Of Tsunami Depositscontrasting

confidence: 70%

Section: Radiocarbon Dating and The Modeled Ages Of Tsunami Depositsmentioning

confidence: 99%

Re-examination of the age of historical and paleo-tsunami deposits at Koyadori on the Sanriku Coast, Northeast Japan

Ishimura

2017

Geosci. Lett.

View full text Add to dashboard Cite

show abstract

“…Research of tsunami deposits has been intensively conducted on and off the Pacific coast in the Tohoku region since the 2011 Tohoku‐oki earthquake (Goto et al ., ; Ishimura and Miyauchi, ; Ikehara et al ., ; Takada et al ., ; Inoue et al ., ; Usami et al ., ), however, in correlating tsunami deposits between terrestrial and marine sediments, the reservoir effect is a critical uncertainty. Therefore, To‐Cu may provide a robust isochronous surface and age marker.…”

Section: Discussionmentioning

confidence: 99%

“…In this study, we measured more than 30 volcanic glass shards using a refractive index measuring system (RIMS 2000: Kyoto Fission Track Co., Ltd). The RIMS system measures the refractive indices of volcanic glass shards with an accuracy of ±0.0002 (Danhara et al, 1992).…”

Section: Tephra Analysismentioning

confidence: 99%

Proximal–distal fall deposit correlation of VEI‐5 tephra (Towada‐Chuseri) from Towada volcano, northeast Japan

Ishimura

Hiramine

2019

J Quaternary Science

View full text Add to dashboard Cite

A tephra layer offers an isochronous surface in sediments, thus serving as a key bed and/or an age marker. Recent high-resolution sediment research (e.g. varved sediments) has revealed optically invisible tephra fingerprints and provided high-precision tephra ages. However, a tephra-based correlation cannot succeed without detailed knowledge of the tephra characteristics in a proximal area to correlate with tephra in high-resolution sediments in remote areas. Here we documented the detailed characteristics of Towada-Chuseri (To-Cu) tephra, which is associated with the Middle Holocene volcanic explosivity index 5 eruption of Towada volcano, northeast Japan. We used To-Cu tephra samples to achieve the proximal-distal correlation of three members: Chuseri pumice (Cu), Kanegasawa pumice (Kn) and Utarube ash (Ut). These distal occurrences correlate with proximal To-Cu tephra based on volcanic glass morphology and refractive index, as well as on major element composition of volcanic glass shards. Refractive indices allow the preliminary correlation of each member, and major element composition helps in distinguishing Ut from the other members. Glass morphology provides additional support. These correlations reveal that To-Cu, especially Cu, covered central to northeast Japan while confirming that To-Cu is the representative tephra in the Middle Holocene of the Tohoku region.

show abstract

“…Tsunami deposits are generated as a consequence of onshore inundation and backwash flow of large water bodies and exhibit many distinct characteristics, ranging from variations in the mineral composition and distribution to particle size range [Atwater and Moore, 1992;Dawson and Shi, 2000;Moore et al, 2006;Morton et al, 2007;Richmond et al, 2011;Ram ırez-Herrera et al, 2007, 2012Goto et al, 2015]. During the last decade, several multidisciplinary studies have been carried out to identify and characterize extreme inundation deposits [e.g., Kortekaas and Dawson, 2007;Ram ırez-Herrera et al, 2007, 2012Font et al, 2010Font et al, , 2013Engel and Br€ uckner, 2011;Wassmer and Gomez, 2011;Shanmugam, 2012;Cuven et al, 2013;Goto et al, 2014Goto et al, , 2015. Since 2010, magnetic parameters such as magnetic susceptibility and anisotropy of magnetic susceptibility (AMS) have proved highly resolving in tsunami deposit research [Font et al, 2010;Wassmer et al, 2010].…”

Section: Introductionmentioning

confidence: 99%

Magnetic signature of the 22June 1932 tsunami deposits (Jalisco,MexicanPacific coast)

Bógalo

Ramírez‐Herrera

Goguitchaichvili

et al. 2017

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Recent studies have demonstrated that rock‐magnetic analysis may provide additional information to distinguish and characterize extreme marine inundation events such as tsunamis. Rock‐magnetic proxies reinforce and improve the environmental evidences supplied by other methods, adding some decisive clues for the interpretation of the origin and genesis of the sedimentary deposits. Here we report rock‐magnetic, XRD, and SEM microscopy results obtained in the Palo Verde estuary (Colima Pacific coast, Mexico) in order to enhance the tools for identification and reconstruction of two tsunami‐induced deposits. The sedimentary sequence includes two sand units, a tsunami deposit (PV1) associated with the 22 June 1932 tsunami and a deeper sandy layer (PV2) related to a possible paleotsunami that occurred around 1300 C.E. Both sandy units are topped by finer grained units. Magnetic properties exhibit a significant correlation with the stratigraphy. High susceptibility (χ) and high saturation isothermal remanence (SIRM) values typical of high concentrations of (titano)magnetite are a distinctive feature of the most recent sandy tsunamigenic unit PV1 and the overlaying soil. The lower sandy tsunamigenic unit PV2 shows significantly lower χ and SIRM values, indicating lower concentration of (titano)magnetite in this unit and the overlaying clayey‐silt unit. The latter also shows a higher coercivity component associated with (titano)hematite. Magnetic grain‐size differences are also observed between PV1 and PV2 suggesting differences in hydraulic conditions at the time of deposition. The bulk mineralogical composition and sediment texture of these units also support the hypothesis of different provenances for each tsunamigenic unit as inferred from magnetic properties.

show abstract

Historical tsunami and storm deposits during the last five centuries on the Sanriku coast, Japan

Cited by 59 publications

References 49 publications

Re-examination of the age of historical and paleo-tsunami deposits at Koyadori on the Sanriku Coast, Northeast Japan

Re-examination of the age of historical and paleo-tsunami deposits at Koyadori on the Sanriku Coast, Northeast Japan

Proximal–distal fall deposit correlation of VEI‐5 tephra (Towada‐Chuseri) from Towada volcano, northeast Japan

Magnetic signature of the 22June 1932 tsunami deposits (Jalisco,MexicanPacific coast)

Contact Info

Product

Resources

About