scholarly journals Five-century record of climate and groundwater recharge variability in southern California

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
F. Manna ◽  
K. M. Walton ◽  
J. A. Cherry ◽  
B. L. Parker
Keyword(s):  
Los Angeles ◽  
Groundwater Recharge ◽  
Southern California ◽  
Surface Soil ◽  
Time Interval ◽  
Chloride Salt ◽  
Freshwater Flow ◽  
The Pacific ◽  
Salt Distribution

AbstractModifications to the rates of water flowing from the surface to groundwater (groundwater recharge) due to climate variability are the most difficult to assess because of the lack of direct long-term observations. Here, we analyze the chloride salt distribution below the surface soil on a plateau near Los Angeles to reconstruct the amount of recharge that occurred in the last five centuries. Over this time interval, periods of major high and low recharge with different duration follow each other and this cyclicity is consistent with long-term atmospheric forcing patterns, such as the Pacific Decadal Oscillation. This study determines the range and the natural variability of recharge to groundwater, which sustains local freshwater flow system, and helps forecast future availability of groundwater resource in southern California, where water scarcity is critical to both local and global populations.

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.

Long-Range Planning for Water Reuse in the City of Los Angeles

1991 ◽  
Vol 24 (9) ◽  
pp. 11-17 ◽  
Author(s):  
Bahman Sheikh
Keyword(s):  
Los Angeles ◽  
Groundwater Recharge ◽  
Water Reuse ◽  
Potable Water ◽  
Reclaimed Water ◽  
Potable Reuse ◽  
Water Demands ◽  
San Fernando ◽  
Near Term

While new sources of affordable potable water for Los Angeles will likely decrease or be unavailable in the future, sources of readily usable reclaimed water will double over the next decade. For many non-potable uses (e.g., landscape irrigation, industrial cooling, toilet flushing), reclaimed water can replace potable water, thereby making equivalent volumes of potable water available. Groundwater recharge with reclaimed water can further augment potable water supplies in significant volumes. Quantitative goals for water reuse were derived by comparing projected water demands with predicted dependable supplies. These goals are to reuse 40, 70, and 80 percent of the total effluent by the years 2010, 2050, and 2090, respectively. In this planning study, several water reuse concepts were evaluated for near-, mid-, and long-term application. For the near-term, several immediately implementable water reuse projects are recommended, involving landscape irrigation, industrial cooling and groundwater recharge. For the mid-term, massive groundwater recharge in San Fernando Valley and in Central and West Coast Basins is recommended. For the long-term, potable reuse and/or groundwater recharge appear to be the best options.

Visions of Glory: The Place of the Azusa Street Revival in Pentecostal History

1996 ◽  
Vol 65 (3) ◽  
pp. 405-424 ◽  
Author(s):  
Joe Creech
Keyword(s):  
Los Angeles ◽  
Holy Spirit ◽  
Southern California ◽  
The People ◽  
The Pacific ◽  
Starting Point ◽  
Divine Activity ◽  
The Holy Spirit ◽  
The Mind ◽  
Azusa Street

As news of the great Welsh Revival of 1904 reached Southern California, Frank Bartleman, an itinerant evangelist and pastor living in Los Angeles, became convinced that God was preparing to revitalize his beloved holiness movement with a powerful, even apocalyptic, spiritual awakening. Certain that events in Wales would be duplicated in California, Bartleman reported in 1905 that “the Spirit is brooding over our land.… Los Angeles, Southern California, and the whole continent shall surely find itself ere long in the throes of a mighty revival.” In 1906 he speculated that theSan Francisco earthquake “was surely the voice of God to the people on the Pacific Coast.” Bartleman indeed witnessed such a revival, for in early April 1906, this “Latter Rain” outpouring had begun to fall on a small gathering of saints led by William J. Seymour, a black holiness preacher. At a vacant AME mission at 312 Azusa Street, countless pentecostals received the baptism of the Holy Spirit evidenced by speaking in other tongues—a “second Pentecost” replicating the first recorded in Acts 2. Bartleman, who also experienced this, would soon become integral to the revival's growth by reporting the events at Los Angeles within a vast network of holiness and higher life periodicals. As during other religious awakenings, such reports not only generated the perception of widespread divine activity but also provided an interpretive scheme for understanding the meaning of such activity. For Bartleman, Azusa was the starting point of a worldwide awakening that would initiate Christ's return. He reported: “Los Angeles seems to be the place, and this the time, in the mind of God, for the restoration of the church to her former place.”

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.

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