Kazuhisa Goto's research while affiliated with The University of Tokyo and other places

Publications (187)

Article
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Massive boulders in landslide and tsunami deposits are prominent geomorphic features in various landscapes. Tracking their movement history is important for reconstructing past geologic dynamics; however, the reworking movements of massive boulders remain unresolved. The boulder field on the Ishigaki Island was formed by repeated tsunamis. Although...
Article
Numerical computations for boulder transport have become a state-of-the-art tool for hindcasting the hydraulic processes associated with past storm wave and tsunami events. Since most previously developed two-dimensional formulations cater to boulders with symmetric outlines, they can consequently reproduce the transport distance and the velocity o...
Article
Full-text available
Paleotsunami studies along the Pacific coast of Tohoku, northern Japan, have been considerably developed recently, particularly after the massive impact of the 2011 Tohoku-oki tsunami. Nevertheless, in the southernmost Shimokita Peninsula, studies pertaining to paleotsunami are underdeveloped, leading to a vague understanding of the tsunamigenic so...
Article
Estimating paleotsunami frequency and size is an important requirement for assessing future tsunami risks. However, several issues such as ground soil erosion by subsequent tsunami waves and the preservation potential of tsunami deposits make it difficult to ascertain the paleotsunami history accurately based solely on tsunami deposits. This study...
Article
Estimating the magnitudes of potential large earthquakes and associated tsunami hazards along a subduction zone is important for risk evaluation. Coastal boulder deposits can serve as valuable geological indicators in intertidal zones with high wave velocity, even though finer sediments are generally washed away. This report presents a new method t...
Preprint
Full-text available
Paleotsunami studies along the Pacific coast of Tohoku, northern Japan, have been considerably developed recently, particuvclarly after the massive impact of the 2011 Tohoku-oki tsunami. Nevertheless, in the southernmost Shimokita Peninsula, studies pertaining to paleotsunami are underdeveloped, leading to vague understanding of the tsunamigenic so...
Article
The interaction between tsunami hydrodynamics and sediment behavior results in a complex depositional process for onshore tsunami deposits. Furthermore, the formation of modern tsunami deposits can be affected by artificial structures, which can make the depositional processes difficult to understand. On the other hand, artificial structures can su...
Article
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Tsunami and storm deposits can be utilized for estimating inundation zones and recurrence intervals of extreme waves in modern, historic, and prehistoric times. However, the distribution of these deposits is extremely complex and affected by various factors such as the size of the waves, topography, bathymetry, and the supply of sediment and its pr...
Article
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Around the world, numerous coastal boulders with weight of few thousand tons are suspected to have been transported by very large tsunamis, although their origins remain enigmatic. For clarifying origins of these boulders, the relation between the tsunami flow depth and the movement of meter-size boulders should be clarified but there is no proper...
Article
During the past 25 years, sedimentary records have formed the basis for abundant research on the history and size of paleotsunamis. Recent events such as the 2004 Indian Ocean and 2011 Tohoku-oki tsunamis have provided valuable opportunities to study the sedimentary features and processes of modern tsunami deposits. Tsunami sedimentology is now a k...
Article
This study conducted a field survey and multiproxy analyses on sediment cores retrieved from the Kobatake-ike pond in Choshi City, Chiba Prefecture, Japan. Kobatake-ike pond is located at a high elevation (i.e., 11 m above present-day sea level) and faces the southern part of the Japan Trench. Three event sand layers were detected within the contin...
Article
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Huge tsunami waves have repeatedly bombarded the southern end of the Ryukyu Islands (Miyako and Yaeyama Islands, southwestern Japan) at several-hundred-year intervals. Therefore, clarifying the islands’ paleotsunami history is important for risk assessment. Nevertheless, discrepancies of paleotsunami histories exist among regional studies of tsunam...
Article
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Several boulder transport formulations are available, which are based on the transport distance of coastal boulders to provide estimates of the hydraulic processes from past storm wave and tsunami events. However, experiments in a small wave tank generally underestimate the transport distance of boulders due to the limited size of the input waves a...
Article
Extreme geophysical events such as asteroid impacts and giant landslides can generate mega-tsunamis with wave heights considerably higher than those observed for other forms of tsunamis. In this paper, we review recent advances in the study of mega-tsunamis in the geological record, focusing on well-documented examples that have captured particular...
Article
Although the 2011 Tohoku-oki earthquake and tsunami were devastating to coastal environments, many of their effects have not lasted: over several years they have generally recovered naturally and artificially. Some environments have not fully recovered or have become stable with some different status. By contrast to the short-lasting tsunami impact...
Article
The mineral apatite, Ca 5 (PO 4) 3 (F,Cl,OH), is a ubiquitous accessory mineral, with its volatile content and isotopic compositions used to interpret the evolution of H 2 O on planetary bodies. During hypervelocity impact, extreme pressures shock target rocks resulting in deformation of minerals; however, relatively few microstructural studies of...
Article
Located near Japan's most densely populated and industrially active region, the Nankai Trough subduction zone has long been highlighted as a high-risk area for damaging earthquakes and tsunamis. In contrast, less attention has been paid the adjacent Ryukyu Trench because historical and geological records are scarce. In order to develop better quant...
Preprint
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Paleotsunami studies along the southern part of Japan Trench are scarce. Additional geological evidence must be collected. This study conducted field survey and multi-proxy analysis for drilling cores taken from a pond of Choshi City, Chiba prefecture, Japan, where the 1677 Enpo tsunami deposit was reported earlier. The pond is suitable for detecti...
Preprint
Full-text available
This study conducted a field survey and multiproxy analyses on sediment cores retrieved from the Kobatake-ike pond in Choshi City, Chiba prefecture, Japan. Kobatake-ike pond is located at a high elevation (i.e., 11 m above present-day sea level) and faces the southern part of the Japan Trench. Three sedimentological events were detected within the...
Article
The Late Paleozoic tectono-magmatic history and basement of the Maya block are poorly understood due to the lack of exposures of coeval magmatic rocks in the region. Recently, IODP-ICDP Expedition 364 recovered drill core samples at borehole M0077A from the peak ring of the Chicxulub impact crater, offshore of the Yucatán peninsula in the Gulf of M...
Article
The ~180-km-diameter Chicxulub peak-ring crater and ~240-km multiring basin, produced by the impact that terminated the Cretaceous, is the largest remaining intact impact basin on Earth. International Ocean Discovery Program (IODP) and International Continental Scientific Drilling Program (ICDP) Expedition 364 drilled to a depth of 1335 m below the...
Article
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The environmental severity of large impacts on Earth is influenced by their impact trajectory. Impact direction and angle to the target plane affect the volume and depth of origin of vaporized target, as well as the trajectories of ejected material. The asteroid impact that formed the 66 Ma Chicxulub crater had a profound and catastrophic effect on...
Article
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Typhoons and associated storm waves in the northwestern Pacific Ocean commonly cause coastal disasters. The possibility remains that an even stronger typhoon than the strongest one observed to date might have occurred before. The development of a method to estimate a maximum intensity of past typhoons over thousands of years is important for paleoc...
Article
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Sedimentary processes and spatial distributions of tsunami deposits in valleys have poorly been understood despite many paleo-tsunami deposits have recently been discovered from sedimentary sequences in valleys. We conducted an exhaustive investigation of 2011 Tohoku-oki tsunami deposits in a narrow valley at the south end of Sendai Plain, northeas...
Article
Historical documents indicate that the AD 1611 Keicho earthquake tsunami struck the Pacific coast of Tohoku, northern Japan. Meanwhile, geological records suggest that a large earthquake occurred along the Kuril Trench in the same century. Although historians and geologists have investigated the events intensively, understanding of those events rem...
Chapter
Coastal boulders potentially provide very useful information to reconstruct hydraulic characteristics of extreme waves such as tsunamis or storm waves that struck shores in historical and prehistoric eras. Boulder transport models, which are strong tools to reconstruct the hydraulic characteristics during boulder transport, can be classified into i...
Chapter
Numerous studies have attempted to use boulder deposits in coastal zones for assessing the hazard due to tsunamis and/or storms. One critical problem is still related to the determination of boulder ages. Although the age of wave-emplaced boulders can often be obtained through ¹⁴C and U/Th dating, marine organisms that were killed during transport...
Article
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Corals at Ishigaki Island, Japan, are characterized by their high species diversity. Not only are they struck by storm waves generated annually by typhoons, the corals, especially the massive ones, in the fringing reef were buffeted by huge tsunami waves with a run-up height of ca. 30 m in 1771 Meiwa tsunami and its predecessors at few hundred-year...
Article
Dating approaches for fine sediment tsunami deposits can be divided into two categories: (1) dating directly using materials from within a tsunami deposit, and (2) dating indirectly using materials from above and below it. For the former, Optically Stimulated Luminescence (OSL) dating has a possible advantage in that is can directly date the burial...
Article
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Highly expanded Cretaceous–Paleogene (K-Pg) boundary section from the Chicxulub peak ring, recovered by International Ocean Discovery Program (IODP)–International Continental Scientific Drilling Program (ICDP) Expedition 364, provides an unprecedented window into the immediate aftermath of the impact. Site M0077 includes ∼130 m of impact melt rock...
Conference Paper
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It is generally accepted the choice of the survey sites will determine the quality of the samples that will be obtained. In tsunami geology, the sampling technique and site choosing criteria are decisive and can set the presence or not of evidence of previous events. In some cases, these elements can define the occurrence of deposits that could see...
Article
At the Koikorobe coast in Iwate Prefecture, we identified two especially large boulders. A boulder, 13.3 × 9.82 × 5.65 m3 and estimated to be 1454 t, is likely not to have been moved by the 2011 tsunami according to the comparison of pre‐tsunami and post‐tsunami aerial photographs between 1977 and 2013. On the other hand, the other boulder, 10.0 ×...
Article
Clifftop coastal boulders transported by storm waves or tsunamis have been reported around the world. Although numerical calculation of boulder transport is a strong tool for the identification of tsunami or storm boulders, and for estimation of the wave size emplacing boulders, models which can reasonably solve boulder transport from below a cliff...
Article
The IODP-ICDP Expedition 364 drilled into the Chicxulub crater, peering inside its well-preserved peak ring. The borehole penetrated a sequence of post-impact carbonates and a unit of suevites and clast-poor impact melt rock at the top of the peak ring. Beneath this sequence, basement rocks cut by pre-impact and impact dykes, with breccias and melt...
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Oceanic impact structures and their exploration via scientific drilling.
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The upper boundary of a tsunami deposit often comprises a mud-dominated layer, called a mud cap, resulting from the different settling times of various grain sizes in the suspended sediment. This mud cap is often visibly indistinguishable from muds that can be deposited under normal circumstances following a tsunami. In fact, dating organic materia...
Article
Holocene sea level change in the northern Indian Ocean was studied using geochemical and geophysical approaches. Molluscs were sub-sampled for radiocarbon dating from sediment cores retrieved from a south Sri Lankan coastal lagoon. They were then combined with previously published sediment core radiocarbon ages from the same lagoon. We observe a ∼2...
Article
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Deformation is a ubiquitous process that occurs to rocks during impact cratering; thus, quantifying the deformation of those rocks can provide first-order constraints on the process of impact cratering. Until now, specific quantification of the conditions of stress and strain within models of impact cratering has not been compared to structural obs...
Article
The Tsenkher structure in the Gobi-Altai, Mongolia is a c . 3.7 km diameter crater with a well-preserved ejecta blanket. It has been hypothesized to be either of impact or volcanic origin in our previous work. Observations during our 2007 expedition and related sample analyses give further support for an impact origin. The evidence includes the pre...
Article
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Evidence for acoustic fluidization in the peak ring rocks of the Chicxulub impact structure.
Article
Expedition 364 was a joint IODP and ICDP mission-specific platform (MSP) expedition to explore the Chicxulub impact crater buried below the surface of the Yucatán continental shelf seafloor. In April and May 2016, this expedition drilled a single borehole at Site M0077 into the crater’s peak ring. Excellent quality cores were recovered from ~ 505 t...
Article
The Hyuga‐nada Sea, south‐eastern Kyushu, Japan, is located between a strong (Nankai Trough) and a weak interplate coupling zone (Ryukyu Trench). Over the past 400 years this area has only experienced Magnitude 7.5 earthquakes or smaller and associated small‐scale tsunamis. However, this short historical record most likely does not include the full...
Chapter
Following the 2011 Tohoku-oki tsunami, many studies were carried out to provide insights into processes involved with this event, as well as to assess its impact on the landscape and the environment, evaluate the evidence that was left behind and how it changed with time. Much can be learned from analogues of events that have occurred in the past,...
Article
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The Cretaceous/Palaeogene mass extinction eradicated 76% of species on Earth1,2. It was caused by the impact of an asteroid3,4 on the Yucatán carbonate platform in the southern Gulf of Mexico 66 million years ago 5 , forming the Chicxulub impact crater6,7. After the mass extinction, the recovery of the global marine ecosystem-measured as primary pr...
Article
Core samples from the Chicxulub impact structure provide insights into the formation processes of a shallow‐marine‐target, complex crater. Although previous studies investigated the impactites (generally suevitic and polymict breccias) of the Yaxcopoil‐1 (YAX‐1) drill core in the Chicxulub impact structure, the interpretation of its deposition rema...
Article
The Japanese community of Shinmachi, established on low-lying land between downtown Hilo and Waiakea, Hawaii, was obliterated by the 1946 Aleutian tsunami but was rebuilt, only to be destroyed again by the 1960 Chilean tsunami. The aim of this study was to find out if any geological evidence of these well documented events had been preserved in the...
Article
Validity and accuracy of numerical model of tsunami-induced sediment transport is the key to clarify the whole picture of the sediment transport by 2011 Tohoku-oki Tsunami, and to predict nearshore disasters by future tsunamis. Thus, verification of the numerical simulations based on the field data and its interpretations are essential to improve t...
Article
We examined the quantitative difference in the distribution of tsunami and storm deposits based on numerical simulations of inundation and sediment transport due to tsunami and storm events on the Sendai Plain, Japan. The calculated distance from the shoreline inundated by the 2011 Tohoku-oki tsunami was smaller than that inundated by storm surges...
Article
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Throughout history, large tsunamis have frequently affected the Sanriku area of the Pacific coast of the Tohoku region, Japan, which faces the Japan Trench. Although a few studies have examined paleo-tsunami deposits along the Sanriku coast, additional studies of paleo-earthquakes and tsunamis are needed to improve our knowledge of the timing, recu...
Article
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The 1703 Genroku Kanto earthquake and the resulting tsunami caused catastrophic damage in the Kanto region of Japan. Previous modeling of the 1703 earthquake applied inversion analyses of the observed terrestrial crustal deformations along the coast of the southern Boso Peninsula and revealed that the tsunami was generated along the Sagami Trough....
Article
Where should we take cores for palaeotsunami research? It is generally considered that local depressions with low energy environments such as wetlands are one of the best places. However, it is also recognised that the presence or absence of palaeotsunami deposits (and their relative thickness) is highly dependent upon subsoil microtopography. In t...
Article
Researches on sediment transport and the depositional process are important for understanding of the whole picture of nearshore disaster caused by the 2011 Tohoku-oki tsunami. In this paper, we analyze data from high-resolution seismic surverys, vibracoring, and bathymetric data assimilation, to describe processes of erosion and sedimentation by th...
Article
Paleotsunami research along the Ryukyu Trench has been undertaken for ca. 50 years. In particular, studies of tsunami-transported boulders have shown that large tsunamis have repeatedly occurred in the Sakishima Islands along the southern Ryukyu Trench, whereas no large tsunamis have affected the Amami and Okinawa islands along the northern and cen...
Article
Erosion by tsunami waves represents an important issue when determining the age of a tsunami deposit, because the age is usually estimated using dating of sediments above and below the deposit. Dating of material within the tsunami deposit, if suitable material is obtainable, can be used to further constrain its age. Eroded sediments are sometimes...
Article
The 2011 Tohoku earthquake, tsunami and resulting damage is often referred to as 3.11 after the date on which it took place. Leading to almost 20 000 people dead or missing, a major nuclear disaster and severe economic damage, 3.11 represents the biggest challenge faced by Japan since the end of World War II. Before 3.11, the possibility of a Mw 9...
Conference Paper
Full-text available
For disaster risk assessment, evaluating characteristics of hazard to focus is essential. Boulders along the coastal areas are important evidence to know impacts of high-energy waves, such as hurricane waves or tsunamis. In this study, position and size of 467 boulders in Playa Ancon, in the southern coast of Sancti Spíritus Province were measured....
Article
The 2004 Indian Ocean tsunami had notable impacts on coastal landforms. Temporal change in topography by coastal erosion and subsequent formation of a new barrier spit on the nearshore of Pakrang Cape, southeastern Thailand, had been monitored for 10 years since 2005 based on field measurement using satellite images, high-resolution differential GP...
Article
Dates of tsunami deposits have been used to estimate paleotsunami recurrence intervals in areas affected by these natural events. The depositional age of tsunami deposits is commonly constrained by the radiocarbon (¹⁴C) dating of sediments above and below the geological event. However, because of calibration curve fluctuations, the depositional age...
Article
Anisotropy of magnetic susceptibility (AMS) and anisotropy of anhysteretic remanence magnetization (AARM) were evaluated for samples collected from units of two unconsolidated sandy event layers, presumed to be paleo-tsunami deposits, from Kiritappu Marsh, northeastern Japan. The AARM technique isolates the fabric of fine-grained (titano)magnetite...