scholarly journals Coseismic deformation of the Wrights tunnel during the 1906 San Francisco earthquake: A key to understanding 1906 fault slip and 1989 surface ruptures in the southern Santa Cruz Mountains, California

1997 ◽  
Vol 102 (B1) ◽  
pp. 635-648 ◽  
Author(s):  
Carol S. Prentice ◽  
Daniel J. Ponti
Keyword(s):  
San Francisco ◽  
Fault Slip ◽  
Coseismic Deformation ◽  
Santa Cruz ◽  
Surface Ruptures

scholarly journals Observations of the 1989 Loma Prieta earthquake

1990 ◽  
Vol 23 (4) ◽  
pp. 235-238
Author(s):  
Peter Marks
Keyword(s):  
San Francisco ◽  
Earthquake Engineering ◽  
City Council ◽  
Water Supply Systems ◽  
National Society ◽  
San Jose ◽  
Santa Cruz ◽  
Loma Prieta Earthquake ◽  
Bay Area ◽  
Loma Prieta

This report has been modified from one presented to the Wellington City Council and sets out observations and conclusions gained from a visit to San Francisco and the area affected by the Loma Prieta Earthquake which struck the San Francisco Bay area on 17 October 1989. I visited the area from 29 November to 8 December 1989. The earthquake occurred at 5.04pm local time and was measured at 7.1 on the Richter scale. It was located 16km NE of Santa Cruz and 30km south of San Jose in the Santa Cruz mountains, 100 km south of San Francisco City. Sixty two people were killed, 994 homes destroyed with 18,000 not occupiable immediately after the earthquake. 155 businesses were destroyed and 2,500 businesses closed temporarily. Cost of damage is estimated at between 6.5 and 10 billion US dollars. San Francisco City suffered a major visitor decline after the earthquake. I attended as one of three members of the New Zealand National Society for Earthquake Engineering "Follow Up" Reconnaissance team for the purpose of establishing what damage had occurred to sewer and stormwater systems, water supply systems and gas utilities. My visit was funded by the Wellington City Council and was mostly devoted to study of sewer and stormwater systems.

scholarly journals COSEISMIC DEFORMATION FIELD AND FAULT SLIP DISTRIBUTION OF THE 2015 CHILE Mw8.3 EARTHQUAKE

2016 ◽  
Vol XLI-B7 ◽  
pp. 827-834
Author(s):  
Chunyan Qu ◽  
Ronghu Zuo ◽  
Xin Jian Shan ◽  
Guohong Zhang ◽  
Yingfeng Zhang ◽  
...  
Keyword(s):  
Elastic Half Space ◽  
Fault Slip ◽  
Deformation Field ◽  
Coseismic Deformation ◽  
Postseismic Deformation ◽  
Coseismic Slip ◽  
Single Plane ◽  
Rupture Length ◽  
Continental Plate ◽  
Before And After

On September 16, 2015, a magnitude 8.3 earthquake struck west of Illapel, Chile. We analyzed Sentinel-1A/IW InSAR data on the descending track acquired before and after the Chile Mw8.3 earthquake of 16 September 2015. We found that the coseismic deformation field of this event consists of many semi circular fringes protruding to east in an approximately 300km long and 190km wide region. The maximum coseismic displacement is about 1.33m in LOS direction corresponding to subsidence or westward shift of the ground. We inverted the coseismic fault slip based on a small-dip single plane fault model in a homogeneous elastic half space. The inverted coseismic slip mainly concentrates at shallow depth above the hypocenter with a symmetry shape. The rupture length along strike is about 340 km with maximum slip of about 8.16m near the trench. The estimated moment is 3.126×1021 N.m (Mw8.27)，the maximum depth of coseismic slip near zero appears to 50km. We also analyzed the postseismic deformation fields using four interferograms with different time intervals. The results show that postseismic deformation occurred in a narrow area of approximately 65km wide with maximum slip 11cm, and its predominant motion changes from uplift to subsidence with time. that is to say, at first, the postseismic deformation direction is opposite to that of coseismic deformation, then it tends to be consistent with coseismic deformation.It maybe indicates the differences and changes in the velocity between the Nazca oceanic plate and the South American continental plate.

SURFACE PROCESS AND FLUVIAL LANDFORM RESPONSE TO THE MS 8.0 WENCHUAN EARTHQUAKE, LONGMEN SHAN, CHINA

2013 ◽  
Vol 07 (05) ◽  
pp. 1350033 ◽  
Author(s):  
Y. LI ◽  
Z. K. YAN ◽  
R. J. ZHOU ◽  
L. SVIRCHEV ◽  
H. B. LI ◽  
...  
Keyword(s):  
Wenchuan Earthquake ◽  
Debris Flows ◽  
Slip Surface ◽  
River Channel ◽  
Coseismic Deformation ◽  
Mountain Range ◽  
River Channels ◽  
Surface Ruptures ◽  
To Come ◽  
Landslides And Debris Flows

The MS 8.0 Wenchuan earthquake of May 12, 2008, in the Longmen Shan mountain range area in China, led to two roughly parallel NE-trending thrust and strike-slip surface ruptures of the Beichuan, Pengguan, and the Xiaoyudong faults. Coseismic deformation changed the topographical gradient and produced massive landslides and debris flows, causing a corresponding response of the fluvial landforms. In this paper, based on data regarding the surface ruptures and changes to the topography and drainage resulting from the earthquake, the influence of the thrusting and strike-slipping on fluvial landforms and drainage are integrated and analyzed. The results are shown for the following five main aspects: (1) the strike-slipping driven by the earthquake caused the formation of new tectonic diversion points of river channels; (2) the thrusting driven by the earthquake caused the formation of new tectonic slope-break points in the river channel; (3) the strikes of the faults activated by the earthquake controlled the river channel direction; (4) the uplifting driven by the earthquake led to changes of riverbed gradient profiles and their base levels; and (5) exceptionally heavy rainfall after the earthquake initiated landslides, debris flows and floods, and will continue to be a hazard for several decades to come.

Coseismic deformation and multi-fault slip model of the 2019 Mindanao earthquake sequence derived from Sentinel-1 and ALOS-2 data

2021 ◽  
Vol 799 ◽  
pp. 228707
Author(s):  
Lei Zhao ◽  
Chunyan Qu ◽  
Xinjian Shan ◽  
Dezheng Zhao ◽  
Wenyu Gong ◽  
...  
Keyword(s):  
Fault Slip ◽  
Earthquake Sequence ◽  
Coseismic Deformation ◽  
Slip Model

scholarly journals Introdução: Queer/Cuir das Américas: tradução, decolonialidade e o incomensurável

2021 ◽  
Vol 1 (15) ◽  
pp. 01-16
Author(s):  
Diego Falconi Trávez ◽  
Lourdes Martínez-Echazábal ◽  
Joseph M. Pierce ◽  
Salvador Vidal-Ortiz ◽  
Maria Amelia Viteri
Keyword(s):  
San Francisco ◽  
Santa Cruz

Editores: Diego Falconí Trávez(Universitat Autònoma de Barcelona/Universidad San Francisco de Quito),Lourdes Martínez-Echazábal (Universidade de Califórnia Santa Cruz/Universidade Federal deSanta Catarina), Joseph M. Pierce (Stony Brook University), Salvador Vidal-Ortiz (AmericanUniversity) e Maria Amelia Viteri (Universidad San Francisco de Quito)

scholarly journals A SEDIMENT TRAPPING EXPERIMENT AT SANTA CRUZ, CA.

1980 ◽  
Vol 1 (17) ◽  
pp. 84
Author(s):  
R.J. Seymour ◽  
G.W. Domurat ◽  
D.M. Pirie
Keyword(s):  
San Francisco ◽  
Entrance Channel ◽  
Monterey Bay ◽  
Northern Coast ◽  
Santa Cruz ◽  
Littoral Drift ◽  
The West ◽  
Sediment Trapping ◽  
Plant Construction ◽  
Inner Channel

Santa Cruz Harbor is located on the northern coast of Monterey Bay, California, approximately 104 kilometers south of San Francisco and 22 kilometers north of Moss Landing, as shown in Figures 1 and 2. Harbor construction was authorized by Congress under the Rivers and Harbors Act of 195S, which provided for a harbor to accommodate light-draft vessels in Woods Lagoon at the eastern boundary of Santa Cruz. The authorized improvements included two rubblemound jetties 360 meters long and 243 meters long, on the west and east sides of an entrance channel, respectively — an entrance channel approximately 270 meters long, 30 meters wide and 6 meters deep, reducing to 45 meters in depth at the same width for an additional HI meters — an inner channel, 240 meters long, 45 meters wide, 45 meters deep, reducing to 3 meters in depth at the same width for an additional 100 meters — a'turning basin approximately 90 meters long, 75 meters wide, and 3 meters deep, and a sand-bypassing plan. Figure 3 shows the project features. The armor units of the seaward side of the west jetty are 28-ton quadripods. The west jetty also has a concrete cap extending to elevation +4. 8 meters MLLW. Construction of the harbor was initiated in February of 1962 with the dredging of Woods Lagoon and the start of work on the west jetty. The west jetty was completed in February 1963. Then work began on the east jetty, and it was completed in April 1963. The entrance channel was dredged to the project dimensions in the summer of 1963. Construction of Santa Cruz Harbor was completed in November 1963, with the exception of the sand-bypassing plant. Construction of the sand-bypassing plant was deferred until the littoral drift rate could be more accurately determined.

scholarly journals Variation and genetic structure of the endangered Lepus flavigularis (Lagomorpha: Leporidae)

2017 ◽  
Vol 65 (4) ◽  
pp. 1322
Author(s):  
Bárbara Cruz Salazar ◽  
Consuelo Lorenzo ◽  
Eduardo Espinoza Medinilla ◽  
Sergio López
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Genetic Structure ◽  
Genetic Differentiation ◽  
San Francisco ◽  
Isolation By Distance ◽  
Santa Cruz ◽  
Management Units ◽  
Lepus Flavigularis ◽  
Santa Maria

Lepus flavigularis, is an endemic and endangered species, with only four populations inhabiting Oaxaca, México: Montecillo Santa Cruz, Aguachil, San Francisco del Mar Viejo and Santa María del Mar. Nevertheless, human activities like poaching and land use changes, and the low genetic diversity detected with mitochondrial DNA and allozymes in previous studies, have supported the urgent need of management strategies for this species, and suggest the definition of management units. For this, it is necessary to study the genetic structure with nuclear genes, due to their inheritance and high polymorphism, therefore, the objective of this study was to examine the variation and genetic structure of L. flavigularis using nuclear microsatellites. We sampled four populations of L. flavigularis and a total of 67 jackrabbits were captured by night sampling during the period of 2001 to 2006. We obtained the genomic DNA by the phenol-chloroform-isoamyl alcohol method. To obtain the diversity and genetic structure, seven microsatellites were amplified using the Polymerase Chain Reaction (PCR); the amplifications were visualized through electrophoresis with 10 % polyacrylamide gels, dyed with ethidium bromide. Genetic diversity was determined using the software GenAlEx v. 6.4, and genetic structure was obtained with ARLEQUIN v. 3.1; null alleles were evaluated using the program Micro-Checker v.2.2.2. Additionally, a Bayesian analysis was performed with software STRUCTURE v. 2.2.3., and the isolation by distance (IBD) was studied using the program PASSAGE v.2.0.11.6. Our results showed that the genetic variation found was low (HO = 0.30, HE = 0.24) when compared to other jackrabbit species. Fixed alleles and moderate levels of genetic differentiation (FST = 0.18, P = 0.001) were detected among populations, indicating the effect of the genetic drift and limited gene flow. Bayesian clustering analysis revealed two groups: (1) jackrabbits from Montecillo Santa Cruz, and (2) individuals living in Aguachil, San Francisco del Mar Viejo and Santa María del Mar. No evidence was found of isolation by distance. It is possible that the geographic barriers present between populations (e.g. lagoons, human settlements), rather than the geographical distance between them, may explain the observed genetic structure. The inbreeding coefficient was negative (FIS = -0.27, P = 0.03), indicating genetic sub-structure in populations. We suggest two management units based on the genetically closer populations, which will help define precise conservation actions in L. flavigularis. This research is the basis for defining translocation of individuals between populations, nevertheless, a more extensive future study, with specific molecular markers for L. flavigularis, is required. In addition, it is necessary to analyze the barriers that limit the gene flow, since it is urgent to reduce the genetic differentiation between populations and increase the genetic diversity of this species. 

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