Aeromagnetic map of parts of Los Angeles, San Bernardino, Bakersfield, Long Beach and Santa Ana 1 degree x 2 degrees quadrangles, California

1996 ◽  
Author(s):  
Keyword(s):  
Los Angeles ◽  
Long Beach ◽  
Santa Ana ◽  
San Bernardino

scholarly journals Regional differences in the impact of the COVID-19 pandemic on food sufficiency in California, April-July, 2020: Implications for food programs and policies

2021 ◽  
pp. 1-23
Author(s):  
Evelyn Blumenberg ◽  
Miriam Pinski ◽  
Lilly A. Nhan ◽  
May C. Wang
Keyword(s):  
Los Angeles ◽  
San Francisco ◽  
Low Income ◽  
Regional Differences ◽  
Online Survey ◽  
Long Beach ◽  
Food Insufficiency ◽  
Assistance Program ◽  
San Bernardino ◽  
The Impact

Abstract Objective: To evaluate regional differences in factors associated with food insufficiency during the initial months of the COVID-19 pandemic among three major metropolitan regions in California, a state with historically low participation rates in the Supplementation Nutrition Assistance Program, the nation’s largest food assistance program. Design: Analysis of cross-sectional data from Phase 1 (April 23 – July 21, 2020) of the U.S. Census Household Pulse Survey, a weekly national online survey. Setting: California, and three Californian Metropolitan Statistical Areas (MSAs), including San Francisco-Oakland-Berkeley, Los Angeles-Long Beach-Anaheim, and Riverside-San Bernardino-Ontario MSAs. Participants: Adults aged 18 years and older living in households. Results: Among the three metropolitan areas, food insufficiency rates were lowest in the San Francisco-Oakland-Berkeley MSA. Measures of disadvantage (e.g. having low-income, being unemployed, recent loss of employment, and pre-pandemic food insufficiency) were widely associated with household food insufficiency. However, disadvantaged households in the San Francisco Bay Area, the area with the lowest poverty and unemployment rates, were more likely to be food insufficient compared to those in the Los Angeles-Long Beach-Anaheim and Riverside-San Bernardino-Ontario MSAs. Conclusions: Food insufficiency risk among disadvantaged households differed by region. To be effective, governmental response to food insufficiency must address the varied local circumstances that contribute to these disparities.

Mineral resources of the Sheep Mountain Wilderness study area and the Cucamonga Wilderness and additions, Los Angeles and San Bernardino counties, California

1977 ◽  
Author(s):  
James G. Evans ◽  
Leroy Pankraatz ◽  
James Ridenour ◽  
Steven W. Schmauch ◽  
Nicholas T. Zilka
Keyword(s):  
Los Angeles ◽  
Mineral Resources ◽  
San Bernardino

scholarly journals Modeling of energy amplification recorded within Greater Los Angeles using irregular structure

1994 ◽  
Vol 84 (1) ◽  
pp. 47-61 ◽  
Author(s):  
Chandan K. Saikia ◽  
Douglas S. Dreger ◽  
Donald V. Helmberger
Keyword(s):  
Los Angeles ◽  
Surface Waves ◽  
Transfer Functions ◽  
Long Beach ◽  
Low Velocity ◽  
Time Duration ◽  
California Institute Of Technology ◽  
Downtown Los Angeles ◽  
Institute Of Technology ◽  
Energy Amplification

Abstract We have investigated energy amplification observed within Greater Los Angeles basin by analyzing regional waveforms recorded from several Nevada Test Site (NTS) nuclear explosions. Although the stations are located nearly at the same azimuth (distances ranging from 350 to 400 km), the seismograms recorded in Compton (the central part of the basin), Long Beach (the southern edge of the basin), and downtown Los Angeles are remarkably different, even for a common explosion. Following the onset of Lg waves, the Long Beach sites have recorded surface waves for more than 100 sec. From one explosion, the sites within downtown Los Angeles have recorded seismograms with strong 3-sec surface waves. These waves are not observed on the seismograms recorded in the neighboring hard-rock site California Institute of Technology (CIT) station. Thus, they must have been generated by local wave guides. Numerically, we modeled these 3-sec waves by convolving the CIT seismogram with the response of a sedimentary strata dipping gently (about 6°) from CIT toward downtown. We also examined the irregular basin effect by analyzing the variation of cumulative temporal energy across the basin relative to the energy recorded at CIT from the same explosion. Variation up to a factor of 30 was observed. To model the energy variation that is caused by extended surface waves in the Long Beach area, we used numerically simulated site transfer functions (STF) from a NNE-SSW oriented two-dimensional basin structure extending from Montebello to Palos Verdes that included low-velocity sedimentary material in the uppermost layers. These STFs were convolved with the CIT seismogram recorded from the MAST explosion. To simulate elongated duration of surface waves, we introduced in the upper sedimentary structure some discontinuous microbasin structures of varying size, each microbasin delaying the seismic waves propagating through them. Consequently, the surface-reflected phases through these structures are delayed and reflected into the upper medium by the underlying interfaces. This mechanism helps delayed energy to appear at a later time and result in a longer time duration at sites located at southern edge of the basin.

Sign in / Sign up

Export Citation Format

Share Document