Recurrence of recent large earthquakes along the southernmost Kurile-Kamchatka Subduction Zone

2007 ◽  
pp. 145-152 ◽  
Author(s):  
Yuichiro Tanioka ◽  
Kenji Satake ◽  
Kenji Hirata
Keyword(s):  
Subduction Zone ◽  
Large Earthquakes

Repeating Earthquakes Along the Colombian Subduction Zone

2020 ◽  
Vol 15 (5) ◽  
pp. 645-654
Author(s):  
Juan Carlos Bermúdez-Barrios ◽  
◽  
Hiroyuki Kumagai
Keyword(s):  
Subduction Zone ◽  
Threshold Value ◽  
Waveform Data ◽  
Repeating Earthquakes ◽  
Seismic Waveform ◽  
Interplate Coupling ◽  
Short Period ◽  
Tectonically Active ◽  
Waveform Similarity ◽  
Large Earthquakes

Colombia is tectonically active, and several large earthquakes have ruptured the Colombia-Ecuador subduction zone (CESZ) during the last century. Among them, the Colombia-Ecuador earthquake in 1906 (Mw 8.4) and the Tumaco earthquake in 1979 (Mw 8.3) generated destructive tsunamis. Therefore, it is important to characterize the seismic rupture processes and their relation with interplate coupling along the CESZ. We searched for repeating earthquakes by performing waveform similarity analysis. Cross correlation (CC) values were computed between earthquake pairs with hypocenter differences of less than 50 km that were located in the northern CESZ (1°–4°N) and that occurred from June 1993 to February 2018. We used broadband and short-period seismic waveform data from the Servicio Geológico Colombiano (SGC) seismic network. A CC threshold value of 0.90 was used to identify the waveform similarity and select repeating earthquakes. We found repeating earthquakes distributed near the trench and the coast. Our estimated repeating earthquakes near the trench suggest that the interplate coupling in this region is low. This is in clear constrast to the occurrence of a large slip in the 1906 Colombia-Ecuador earthquake along the trench in the southern part of the CESZ, and suggests that rupture modes are different between the northern and southern parts of CESZ near the trench.

scholarly journals Paleotsunamis on the Southern Hikurangi Subduction Zone, New Zealand, Show Regular Recurrence of Large Subduction Earthquakes

2021 ◽  
Vol 1 (2) ◽  
pp. 75-84
Author(s):  
Charlotte Pizer ◽  
Kate Clark ◽  
Jamie Howarth ◽  
Ed Garrett ◽  
Xiaoming Wang ◽  
...  
Keyword(s):  
Confidence Interval ◽  
Subduction Zone ◽  
Recurrence Interval ◽  
Fault System ◽  
Plate Boundaries ◽  
The Past ◽  
Subduction Earthquakes ◽  
Tsunami Hazard Assessment ◽  
First Time ◽  
Large Earthquakes

Abstract Geological records of subduction earthquakes, essential for seismic and tsunami hazard assessment, are difficult to obtain at transitional plate boundaries, because upper-plate fault earthquake deformation can mask the subduction zone signal. Here, we examine unusual shell layers within a paleolagoon at Lake Grassmere, at the transition zone between the Hikurangi subduction zone and the Marlborough fault system. Based on biostratigraphic and sedimentological analyses, we interpret the shell layers as tsunami deposits. These are dated at 2145–1837 and 1505–1283 yr B.P., and the most likely source of these tsunamis was ruptures of the southern Hikurangi subduction interface. Identification of these two large earthquakes brings the total record of southern Hikurangi subduction earthquakes to four in the past 2000 yr. For the first time, it is possible to obtain a geologically constrained recurrence interval for the southern Hikurangi subduction zone. We calculate a recurrence interval of 500 yr (335–655 yr, 95% confidence interval) and a coefficient of variation of 0.27 (0.0–0.47, 95% confidence interval). The probability of a large subduction earthquake on the southern Hikurangi subduction zone is 26% within the next 50 yr. We find no consistent temporal relationship between subduction earthquakes and large earthquakes on upper-plate faults.

THE MEXICAN SUBDUCTION ZONE - GEOLOGICAL AND HISTORICAL EVIDENCE OF LARGE EARTHQUAKES AND TSUNAMIS

2020 ◽  
Author(s):  
María-Teresa Ramírez-Herrera ◽  
◽  
Nestor Corona ◽  
Marcelo Lagos ◽  
Rocío Castillo Aja ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Historical Evidence ◽  
Large Earthquakes ◽  
Mexican Subduction Zone

scholarly journals Differences in Epicentral Location of Mexican Earthquakes between Local and Global Catalogs: An update

2016 ◽  
Vol 55 (1) ◽  
Author(s):  
Vala Hjörleifsdóttir ◽  
Shri Krishna Singh ◽  
Allen Husker
Keyword(s):  
Subduction Zone ◽  
Velocity Structure ◽  
The United States ◽  
The State ◽  
The Pacific ◽  
Different Types ◽  
The Pacific Ocean ◽  
Epicentral Location ◽  
Large Earthquakes ◽  
Mexican Subduction Zone

Differences in epicentral locations between local and global catalogs for earthquakes in the Mexican subduction zone were first observed to be biased in the 1980s, based on a few well studied events. In this study we compare locations between two local catalogs; (1) a recent high precision catalog of events in the state of Guerrero and (2) the catalog of the Servicio Sismológico Nacional (SSN), to the global catalog of the United States Geological Service (USGS). We find that on average epicentral locations in the global catalog of earthquakes larger than M 5 in the Mexican subduction zone are 26 km towards N54°E of those in the local catalogs. We investigate how the errors vary for different types of earthquakes in Guerrero, and how they vary along the trench, from the state of Jalisco to the state of Chiapas. The average differences are largest for thrust events occurring close to the trench, and for events in Michoacán. The differences are greater on average for large earthquakes than for small. There is a trade-off between the distance from the trench and timing, suggesting a poor resolution of these parameters, due to the lack of stations the Pacific Ocean. We attribute the differences in locations to systematic patterns in the velocity structure of the mantle, with consistently fast paths to the northeast and relatively slow paths towards the southwest.

Seismic gaps and recurrence periods of large earthquakes along the Mexican subduction zone: A reexamination

1981 ◽  
Vol 71 (3) ◽  
pp. 827-843 ◽  
Author(s):  
S. K. Singh ◽  
L. Astiz ◽  
J. Havskov
Keyword(s):  
Subduction Zone ◽  
Risk Estimation ◽  
Source Parameters ◽  
Seismic Energy ◽  
B Value ◽  
Dislocation Model ◽  
Past Century ◽  
Seismic Gaps ◽  
Large Earthquakes ◽  
Mexican Subduction Zone

abstract Seismic gaps and recurrence periods of large, shallow interplate earthquakes along the Mexican subduction zone are reexamined after combining information from a catalog of nineteenth century's earthquakes, some relocated epicenters of the early part of this century, source parameters of recent large earthquakes, and redetermined magnitudes of great, shallow earthquakes of this century. Tehuantepec and Michoacan gaps have not experienced a large shock in this century and perhaps none in the past century; they are either aseismic or have anomalously large repeat times. Guerrero, Jalisco, and Ometepec regions presently appear to have a high seismic potential. Observed average repeat times of large earthquakes (Ms ≳ 7.4) in six regions (east, central, and west Oaxaca, San Marcos, Petatlan, and Colima) are between 32 to 56 yr. Data of this century indicate that the strain is released mostly in large events (Ms ≳ 7.4). A simple dislocation model with parameters obtained from the studies of recent earthquakes explains the observed recurrence periods quite well. The b value for this zone is not meaningful, an observation which is of significance for seismic risk estimation. Most of seismic moment (or, equivalently, seismic energy) release since 1800 appears to occur for 15 yr followed by relative quiescence in the next 15 yr.

Variations of b-values preceding large earthquakes in the Andaman–Sumatra subduction zone

2012 ◽  
Vol 61 ◽  
pp. 237-242 ◽  
Author(s):  
Paiboon Nuannin ◽  
Ota Kulhánek ◽  
Leif Persson
Keyword(s):  
Subduction Zone ◽  
B Values ◽  
Large Earthquakes
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