NOTE ON THE CHANGE IN FREQUENCY OF THE REFLECTION FROM BASEMENT AS THIS REFLECTING HORIZON INCREASES IN DEPTH

Geophysics ◽  
1940 ◽  
Vol 5 (2) ◽  
pp. 194-195 ◽  
Author(s):  
Sidon Harris ◽  
N. A. Haskell
Keyword(s):  
San Joaquin Valley ◽  
East Side ◽  
Approximate Representation ◽  
Total Distance

Summary—A table is presented showing the variation in frequency of the reflection obtained from “basement” as this horizon increases in depth. The data were derived from seismograms obtained in the San Joaquin Valley, north of Bakersfield, California. The so‐called “basement” reflecting horizon is followed from a depth of about 1300 feet on the east side to a depth of about 4400 feet farther out toward the middle of the Valley. The results indicate that the frequency of the reflection decreases by about 27 per cent while the depth of the reflecting horizon increases approximately 340 per cent. Gutenberg’s equation, [Formula: see text], where T is the period of the wave, D is the total distance travelled, and a is a constant, gives an approximate representation of these observations if [Formula: see text] and a=0.05 when T is expressed in thousandths of a second and D in feet.

MULTIPLE‐REFLECTION EVIDENCE

Geophysics ◽  
1948 ◽  
Vol 13 (1) ◽  
pp. 41-44 ◽  
Author(s):  
Joseph C. Waterman
Keyword(s):  
San Joaquin Valley ◽  
Multiple Reflection ◽  
East Side ◽  
Multiple Reflections ◽  
Basement Complex ◽  
Well Data

A rather interesting example of multiple reflections was found in one area in Madera County on the east side of the San Joaquin Valley of California. In this region the top of the basement complex is an excellent reflecting horizon, and the determination of the depth of the basement was confirmed by well data.

DISCUSSION—MULTIPLE REFLECTIONS

Geophysics ◽  
1948 ◽  
Vol 13 (1) ◽  
pp. 57-57
Author(s):  
C. H. Dresbach
Keyword(s):  
San Joaquin Valley ◽  
Velocity Data ◽  
East Side ◽  
Multiple Reflections ◽  
Multiple Events

In various places along the east side of the San Joaquin Valley, roughly thirty miles north of Bakersfield, reflected events have been observed that plotted below the known top of the basement. Sufficient well and velocity data are available to locate them quite closely. From what is known of the character of the basement material, it appears unlikely that the rather smoothly plotting, fairly continuous events could originate from within the basement. The conclusion is therefore forced that they must represent multiple events of some sort.

The San Joaquin Valley East Side Perspective

2006 ◽  
Author(s):  
Walter P. Ward ◽  
William R. Johnston ◽  
Michael Niemi
Keyword(s):  
San Joaquin Valley ◽  
East Side

Transportation and the Environment

2017 ◽  
Vol 94 (3) ◽  
pp. 37-61
Author(s):  
Douglas R. Littlefield
Keyword(s):  
Nineteenth Century ◽  
San Francisco ◽  
Sierra Nevada ◽  
Mississippi River ◽  
San Joaquin Valley ◽  
Eastern United States ◽  
Major Health ◽  
San Joaquin River ◽  
Natural Wetlands ◽  
Prevailing View

Some histories of California describe nineteenth-century efforts to reclaim the extensive swamplands and shallow lakes in the southern part of California's San Joaquin Valley – then the largest natural wetlands habitat west of the Mississippi River – as a herculean venture to tame a boggy wilderness and turn the region into an agricultural paradise. Yet an 1850s proposition for draining those marshes and lakes primarily was a scheme to improve the state's transportation. Swampland reclamation was a secondary goal. Transport around the time of statehood in 1850 was severely lacking in California. Only a handful of steamboats plied a few of the state's larger rivers, and compared to the eastern United States, roads and railroads were nearly non-existent. Few of these modes of transportation reached into the isolated San Joaquin Valley. As a result, in 1857 the California legislature granted an exclusive franchise to the Tulare Canal and Land Company (sometimes known as the Montgomery franchise, after two of the firm's founders). The company's purpose was to connect navigable canals from the southern San Joaquin Valley to the San Joaquin River, which entered from the Sierra Nevada about half way up the valley. That stream, in turn, joined with San Francisco Bay, and thus the canals would open the entire San Joaquin Valley to world-wide commerce. In exchange for building the canals, the Montgomery franchise could collect tolls for twenty years and sell half the drained swamplands (the other half was to be sold by the state). Land sales were contingent upon the Montgomery franchise reclaiming the marshes. Wetlands in the mid-nineteenth century were not viewed as they are today as fragile wildlife habitats but instead as impediments to advancing American ideals and homesteads across the continent. Moreover, marshy areas were seen as major health menaces, with the prevailing view being that swampy regions’ air carried infectious diseases.

Romano-British and Medieval Extra-Mural Settlement at Chesil Street, Winchester

2019 ◽  
Vol 74 (1) ◽  
pp. 98-126
Author(s):  
Piotr Orczewski ◽  
Phil Andrews ◽  
Wendy Carruthers ◽  
Dana Challinor ◽  
L Higbee ◽  
...  
Keyword(s):  
Previous Investigation ◽  
East Side ◽  
Lime Kiln ◽  
Car Park

Excavations were undertaken in 2016 in advance of development at Chesil Street car park, Winchester, to the east of the Roman and medieval city defences, in a part of the eastern suburb that has seen little previous investigation. The work revealed four Romano-British pits – at least one possibly a lime kiln, extensive areas of chalk quarrying and several medieval features including a chalk-lined cess pit that contained well-preserved environmental evidence. Post-medieval remains comprised five wells in addition to wall foundations alongside Chesil Street, while the east side of the site had been truncated by construction of a railway opened in 1895.

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