scholarly journals The role of asperities in seismicity frequency-magnitude relations using the TREMOL v0.1.0. The case of the Guerrero-Oaxaca subduction zone, México

2020 ◽  
Author(s):  
Marisol Monterrubio-Velasco ◽  
F. Ramón Zúñiga ◽  
Armando Aguilar-Meléndez ◽  
Otilio Rojas ◽  
Quetzalcóatl Rodríguez-Pérez ◽  
...  

Abstract. Seismicity and magnitude distributions are fundamental for any type of seismic hazard analysis. The Mexican subduction zone along the Pacific Coast is one of the most active seismic zones in the world. Some peculiar characteristics of the seismicity have been observed for a subregion of the subduction regime, which has been named SUB3 in a recent seismotectonic regionalization of the country, suggesting that the observed simplicity of this source arises from the rupturing of single asperities. In this work, we numerically test this hypothesis using the TREMOL (sThochastic Rupture Earthquake MOdeL) v0.1.0 code. As test cases, we choose four of the most significant events (6.5 

1995 ◽  
Vol 11 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Brian F. Atwater ◽  
Alan R. Nelson ◽  
John J. Clague ◽  
Gary A. Carver ◽  
David K. Yamaguchi ◽  
...  

Earthquakes in the past few thousand years have left signs of land-level change, tsunamis, and shaking along the Pacific coast at the Cascadia subduction zone. Sudden lowering of land accounts for many of the buried marsh and forest soils at estuaries between southern British Columbia and northern California. Sand layers on some of these soils imply that tsunamis were triggered by some of the events that lowered the land. Liquefaction features show that inland shaking accompanied sudden coastal subsidence at the Washington-Oregon border about 300 years ago. The combined evidence for subsidence, tsunamis, and shaking shows that earthquakes of magnitude 8 or larger have occurred on the boundary between the overriding North America plate and the downgoing Juan de Fuca and Gorda plates. Intervals between the earthquakes are poorly known because of uncertainties about the number and ages of the earthquakes. Current estimates for individual intervals at specific coastal sites range from a few centuries to about one thousand years.


1961 ◽  
Vol 35 (S1) ◽  
pp. 217-228 ◽  
Author(s):  
Satyu Yamaguti

It is my greatest pleasure and honour to contribute a part of the series of my studies on the helminth fauna of Japan in honour of Professor R. T. Leiper, one of the most distinguished helminthologists in the world. The material on which the present paper is based was collected at the Tamano Marine Laboratory of Okayama University on the Inland Sea of Japan except for a new species of Raphidascaroides which was taken by Mr. T. Yamamoto at the Marine Biological Laboratory, Kyoto University, on the Pacific coast of Wakayama Prefecture. Acknowledgments are due to the staff of the Tamano Marine Laboratory and also to Mr. Yamamoto for their generous supply of the material.


1990 ◽  
Vol 59 (3) ◽  
pp. 340-355 ◽  
Author(s):  
Winton U. Solberg

The westward movement carried Americans to the banks of the Mississippi River by 1840, and in the following decade hardy pioneers began crossing the plains and mountains to settle on the Pacific coast. Gold was discovered at Sutter's Mill near present-day Sacramento on 24 January 1848, and the ensuing gold rush created a spectacle such as the world had never seen before.


2012 ◽  
Vol 13 (3) ◽  
pp. 401-417
Author(s):  
JAN-ERIK LANE

AbstractThe Republic of Fiji Islands has been under military rule since December 2006. Yet, the regime of Frank Bainimarama is not really like any other military regime in the world, nor does the 2006 coup resemble the earlier military interventions in the country. It is attempting development without freedom, but can it succeed? It is important to recognize that dictatorships can be of very different kinds. What happens with the Bainimarama regime will have a major impact upon the Pacific scene, not only for the Fiji Islands but also for the Pacific Forum and the role of China in regional integration. And the course of future events will depend much upon what strategy Fiji's strongman chooses and what kind of constitution is put in place.


1996 ◽  
Vol 7 (4) ◽  
pp. 313-340 ◽  
Author(s):  
Joanne Pillsbury

The acquisition and use of exotic, valuable, and ritually important elite goods is a prominent feature of many imperial political economies. After an extensive review of the archaeological and documentary sources on one specific valuable in the empire of Chimor, this paper analyzes the visual representation of such goods, an aspect seldom addressed by archaeologists. An architectural relief recently excavated at Chan Chan, the capital of Chimor, sheds new light on the use of exotic materials and long-distance trade and exchange along the Pacific coast of South America in the late Prehispanic period. This relief, named "Los Buceadores" (The Divers) for the principal imagery depicting Spondylus divers, is important for elucidating the role of this valuable in the early development of the Chimú empire. It is argued that the Chimú rulers sponsored a long-distance exchange network during an early stage of the expansion of the Chimú polity and that the fruits of this network, particularly Spondylus, formed a critical element in the formation and maintenance of the ritual and economic basis of power for the expanding state.


2003 ◽  
Vol 72 (2) ◽  
pp. 229-263 ◽  
Author(s):  
Rolf Swensen

There has never been a social history of Christian Science, a distinctive and controversial new religious group that emphasized metaphysical healing. The group appeared in the United States in the 1870s and 1880s under the leadership of Mary Baker Eddy. This article examines the early rapid growth of Christian Science on the Pacific Coast, for the religion flourished to a greater degree in this health- conscious and socially fluid region than in any other section of the world. Analysis of the occupations of more than 1,000 members and spouses of six Christian Science churches in California, Oregon, and Washington for the years 1905-1907 provides detailed conclusions at variance with previous conjecture. The new evidence shows that Christian Scientists on the Pacific Coast were an ethnically homogeneous, uprooted, and energetic lot from all social levels, with a surprisingly large contingent from the working classes.


Oryx ◽  
1972 ◽  
Vol 11 (6) ◽  
pp. 441-448 ◽  
Author(s):  
Don Hunsaker

Colombia has one of the largest bird faunas in the world – over 1550 species, over 300 mammals, including the endangered spectacled bear and mountain tapir, 350 reptiles and over 1000 fish, and a vast range of habitats, from the tropical rain forest of the Pacific coast and lowland swamps to the spectacular peaks of the high Andes, 20,000 feet and more. In recent years Colombia has set aside over 3½ million acres for national parks and reserves, which are described here by Dr Hunsaker, Conservation Co-ordinator with INDERENA (the Government department concerned) for the Peace-Corps-Smithsonian Program in Bogotá. Colombia's conservation efforts began in 1919 with the passing of the first laws protecting the fauna and flora. In 1941 the Government introduced hunting regulations, and in 1948 the first biological reserve, La Macarena, was set aside. A law passed in 1954 made the condor the first fully protected species. Since then government, universities and interested people have worked to coordinate, in so far as possible, the national park system, the wildlife service and university projects to protect wilderness and wildlife in this extremely critical region of South America.


2011 ◽  
Vol 25 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Nazlı Olgun ◽  
Svend Duggen ◽  
Peter Leslie Croot ◽  
Pierre Delmelle ◽  
Heiner Dietze ◽  
...  

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