Variability of megathrust earthquakes in the world revealed by the 2011 Tohoku-oki Earthquake

Koyama, Junji; Yoshizawa, Kazunori; Yomogida, Kiyoshi; Tsuzuki, Motohiro

doi:10.5047/eps.2012.04.011

Cited by 15 publications

(11 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This eliminates the possibility of (D) for the different tsunami excitation. Speaking about (E), the results from both the local and far-field tsunami magnitude give consistent results in Equations (4) and (5). Therefore, the effect of local ocean-bottom structures alone is not the reason.…”

Section: Discussionsupporting

confidence: 52%

“…The 1952 Kamchatka earthquake of Mw 9.0 and the 1964 Alaska earthquake of Mw9.2 are pointed out to be of ADDS type, while the 1960 Chile earthquake of Mw9.5 and the 2010 Maule earthquake of Mw8.8 are of ASSS [4,5]. Speaking about the 2004 Sumatra-Andaman earthquake of Mw9.3, the faulting process is peculiar.…”

Section: Diversity Of Megathrust Earthquakes In the Worldmentioning

confidence: 99%

“…It has been pointed out recently that observations of their seismic activity in recent years revealed that the megathrust earthquakes occurred in seismic segments of either Along-strike Single Segmentation (ASSS) or Along-dip Double Segmentation (ADDS) [4][5][6]. The different seismic segmentations-ASSS and ADDS-have been identified, referring to their regional seismic-activity, focal mechanisms, rupture patterns, geometry of subduction zones, types of overriding plates and back-arc activity [5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tsunamigenic Earthquakes at Along-dip Double Segmentation and Along-strike Single Segmentation near Japan

Koyama

Tsuzuki

Yomogida

2015

JMSE

Self Cite

View full text Add to dashboard Cite

A distinct difference of the earthquake activity in megathrust subduction zones is pointed out, concerning seismic segmentations in the vicinity of Japan-that is, the apparent distribution of earthquake hypocenters characterized by Along-dip Double Segmentation (ADDS) and Along-strike Single Segmentation (ASSS). ADDS is double aligned seismic-segmentation of trench-ward seismic segments along the Japan Trench and island-ward seismic segments along the Pacific coast of the Japan Islands. The 2011 Tohoku-oki megathrust earthquake of Mw9.0 occurred in ADDS. In the meantime, the subduction zone along the Nankai Trough, the western part of Japan, is the source region of a multiple rupture of seismic segments by the 1707 Houei earthquake, the greatest earthquake in the history of Japan. This subduction zone is narrow under the Japan Islands, which is composed of single aligned seismic-segmentation side by side along the Nankai Trough, which is typical of ASSS. Looking at the world seismicity, the 1960 and 2010 Chile megathrusts, for example, occurred in ASSS, whereas the 1952 Kamchatka and the 1964 Alaska megathrusts occurred in ADDS. These megathrusts in ADDS result from the rupture of strong asperity in the trench-ward seismic segments. Since the asperity of earthquakes in OPEN ACCESSJ. Mar. Sci. Eng. 2015, 3 1179 ASSS is concentrated in the shallow part of subduction zones and the asperity of frequent earthquakes in ADDS is in deeper parts of the island-ward seismic segments than those of ASSS, there must be a difference in tsunami excitations due to earthquakes in ADDS and ASSS. An analysis was made in detail of tsunami and seismic excitations of earthquakes in the vicinity of Japan. Tsunami heights of ASSS earthquakes are about two times larger than those of ADDS earthquakes with the same value of seismic moment. The reason for this different tsunami excitation is also considered in relation to the seismic segmentations of ADDS and ASSS.

show abstract

Section: Discussionsupporting

confidence: 52%

Section: Diversity Of Megathrust Earthquakes In the Worldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tsunamigenic Earthquakes at Along-dip Double Segmentation and Along-strike Single Segmentation near Japan

Koyama

Tsuzuki

Yomogida

2015

JMSE

Self Cite

View full text Add to dashboard Cite

show abstract

“…Globally studies of subducting seamount systems suggest that large fracture zones are formed surrounding the seamount, and the highly fractured region can act as barriers to hinder the rupture propagation (e.g., Wang & Bilek 2011). Because the stress concentration in and around the fracture zones is high and may easily reach failure criteria, the seamount can trigger (e.g., Kumagai et al 2012;Koyama et al 2013) the failure of highly stressed asperities in the neighborhood, nucleating as a great earthquake (e.g., Kumagai et al 2012;Koyama et al 2013). Previous studies also suggest that seamounts cause persistent fault creep (e.g., Singh et al 2011) TPGA are relatively aseismic (Song and Simons, 2003).…”

Section: Rupture Segment 2 (Zone 2 16°n-19°n)mentioning

confidence: 99%

Revised earthquake sources along Manila Trench for tsunami hazard assessment in the South China Sea

Qiu¹,

Li²,

Hsu³

et al. 2019

Preprint

View full text Add to dashboard Cite

Abstract. Seismogenic tsunami hazard assessments are highly dependent on the reliability of earthquake source models. Here in a study of the Manila subduction zone (MSZ) system, we combine the geological characteristics of the subducting plate, the geometry, and coupling state of the subduction interface to propose a series of fault rupture scenarios. We divide the subduction zone into three rupture segments: 14° N–16° N, 16° N–19° N and 19° N–21.7° N inferred from geological structures associated with the down-going Sunda plate. Each of these segments is capable of generating earthquakes of magnitude between Mw 8.5+ and Mw 9+, assuming a-1000-year seismic return period as suggested by previous studies. The most poorly constrained segment of the MSZ lies between 19° N–21.7° N, and here we use both local geological structures and characteristics of other subduction zone earthquakes around the world, to investigate the potential rupture characteristics of this segment. We consider multiple rupture modes for tsunamigenic-earthquake type and megathrust-splay fault earthquakes. These rupture models facilitate an improved understanding of the potential tsunami hazard in the South China Sea (SCS). Hydrodynamic simulations demonstrate that coastlines surrounded the SCS could be devastated by tsunami waves up to 10-m if large megathrust earthquakes occur in these segments. The regions most prone to these hazards include west Luzon of Philippines, southern Taiwan, the southeastern China, central Vietnam and the Palawan Island.

show abstract

“…Koyama et al 2013). A simple classification based on three criteria, alongstrike segment boundary, along-dip segmentation and the direction of collision (orthogonal or oblique), although useful to sort out some basic differences, still lacks the necessary details and hence forces one to think in terms of these end members only.…”

Section: Mega-thrust Earthquakesmentioning

confidence: 99%

On the Origin of Mega-thrust Earthquakes

Atakan

2015

Perspectives on European Earthquake Engineering and Seismology

View full text Add to dashboard Cite

Out of 17 largest earthquakes in the world since 1900 with magnitudes larger than 8.5, 15 of them occurred along convergent plate boundaries as megathrust events. Four of these catastrophic earthquakes have occurred during the last decade. The wealth of observational data from these events offer a unique opportunity for Earth Scientists to understand the underlying processes leading to the deformation in subductions zones, not only along the plate interface, but also in plate interiors in both the subducting slab and the overriding plate.

show abstract

Variability of megathrust earthquakes in the world revealed by the 2011 Tohoku-oki Earthquake

Cited by 15 publications

References 43 publications

Tsunamigenic Earthquakes at Along-dip Double Segmentation and Along-strike Single Segmentation near Japan

Tsunamigenic Earthquakes at Along-dip Double Segmentation and Along-strike Single Segmentation near Japan

Revised earthquake sources along Manila Trench for tsunami hazard assessment in the South China Sea

On the Origin of Mega-thrust Earthquakes

Contact Info

Product

Resources

About