Reconnaissance surficial geologic maps of the Newhall, Oat Mountain, Santa Susana, and Val Verde 7 1/2-minute quadrangles, Los Angeles and Ventura counties, southern California

1976 ◽  
Author(s):  
Douglas M. Morton
Keyword(s):  
Los Angeles ◽  
Southern California ◽  
Geologic Maps

The Sunland Grizzly

2014 ◽  
Vol 91 (4) ◽  
pp. 56-63
Author(s):  
Josh Sides
Keyword(s):  
Los Angeles ◽  
Los Angeles County ◽  
Southern California ◽  
Grizzly Bear ◽  
Science And Art ◽  
Founding Director

In 1916, Cornelius Birket Johnson, a Los Angeles fruit farmer, killed the last known grizzly bear in Southern California and the second-to last confirmed grizzly bear in the entire state of California. Johnson was neither a sportsman nor a glory hound; he simply hunted down the animal that had been trampling through his orchard for three nights in a row, feasting on his grape harvest and leaving big enough tracks to make him worry for the safety of his wife and two young daughters. That Johnson’s quarry was a grizzly bear made his pastoral life in Big Tujunga Canyon suddenly very complicated. It also precipitated a quagmire involving a violent Scottish taxidermist, a noted California zoologist, Los Angeles museum administrators, and the pioneering mammalogist and Smithsonian curator Clinton Hart Merriam. As Frank S. Daggett, the founding director of the Los Angeles County Museum of History, Science and Art, wrote in the midst of the controversy: “I do not recollect ever meeting a case where scientists, crooks, and laymen were so inextricably mingled.” The extermination of a species, it turned out, could bring out the worst in people.

scholarly journals A revised position for the primary strand of the Pleistocene-Holocene San Andreas fault in southern California

2021 ◽  
Vol 7 (13) ◽  
pp. eaaz5691
Author(s):  
Kimberly Blisniuk ◽  
Katherine Scharer ◽  
Warren D. Sharp ◽  
Roland Burgmann ◽  
Colin Amos ◽  
...  
Keyword(s):  
Los Angeles ◽  
Southern California ◽  
San Andreas Fault ◽  
Slip Rate ◽  
Large Magnitude ◽  
Slip Rates ◽  
San Andreas ◽  
The Pacific ◽  
Large Earthquakes ◽  
Dependent Probability

The San Andreas fault has the highest calculated time-dependent probability for large-magnitude earthquakes in southern California. However, where the fault is multistranded east of the Los Angeles metropolitan area, it has been uncertain which strand has the fastest slip rate and, therefore, which has the highest probability of a destructive earthquake. Reconstruction of offset Pleistocene-Holocene landforms dated using the uranium-thorium soil carbonate and beryllium-10 surface exposure techniques indicates slip rates of 24.1 ± 3 millimeter per year for the San Andreas fault, with 21.6 ± 2 and 2.5 ± 1 millimeters per year for the Mission Creek and Banning strands, respectively. These data establish the Mission Creek strand as the primary fault bounding the Pacific and North American plates at this latitude and imply that 6 to 9 meters of elastic strain has accumulated along the fault since the most recent surface-rupturing earthquake, highlighting the potential for large earthquakes along this strand.

scholarly journals Longitudinal Tracking of Vape Shop Compliance With State Business Regulations Within Southern California Ethnic Neighborhoods During the COVID-19 Pandemic

2021 ◽  
Vol 44 (1) ◽  
pp. 87-92
Author(s):  
Donna Medel ◽  
Artur Galimov ◽  
Leah Meza ◽  
Jane K. Steinberg ◽  
Carla J. Berg ◽  
...  
Keyword(s):  
Los Angeles ◽  
Southern California ◽  
Ethnically Diverse ◽  
Ethnic Communities ◽  
Contextual Risk ◽  
Business Operations ◽  
Longitudinal Tracking ◽  
Business Regulations ◽  
Stage 1 ◽  
Vape Shops

The overall aim of this study is to examine vape shop business operations during COVID-19 among a cohort of 88 vape shops in the Greater Los Angeles area in Southern California, located in ethnically diverse communities. A total of six web- and/or phone-based assessments were conducted over a 12-week period (April 1, 2020–June 10, 2020), extending from the mandated closure of nonessential businesses (Stage 1; Assessments 1–3) to the reopening of nonessential sectors (Stage 2; Assessments 4–6), to evaluate business operations (open and closure statuses). The proportion of vape shops found to be noncompliant with the Governor’s executive order (i.e., open) during Stage 1 gradually increased from 54 (61.4%) at Assessment 1 (week of April 1, 2020) to 58 (65.9%) at Assessment 3 (week of April 29, 2020). Moreover, vape shops located in Hispanic/Latino and Korean/Asian communities (vs. those in non-Hispanic White and African American communities) were more likely to stay open both during and after the shutdown at Assessments 1 and 6. More specifically, vape shops located in Hispanic/Latino communities were significantly more likely to offer walk-in service during Assessment 1 (during the shutdown), and vape shops in Hispanic/Latino and Korean/Asian were significantly more likely to offer walk-in service during Assessment 6 (after the re-opening). This study demonstrates high rates of noncompliance with shutdown orders among vape shops located in ethnic communities, thus suggesting higher contextual risk factors of COVID-19 exposure among certain ethnic communities.

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