Gravity data collected along the Los Angeles Regional Seismic Experiment (LARSE) and preliminary model of regional density variations in basement rocks, southern California

by Victoria E. Langenheim

Publisher: U.S. Geological Survey in [Menlo Park, CA]

Written in English
Published: Pages: 25 Downloads: 31
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Subjects:

  • Gravity anomalies -- California -- Los Angeles Region,
  • Geology, Structural -- California -- Los Angeles Region
  • Edition Notes

    Statementby V.E. Langenheim and R.C. Jachens
    SeriesOpen-file report -- 96-682, U.S. Geological Survey open-file report -- 96-682
    ContributionsJachens, Robert C, Geological Survey (U.S.)
    The Physical Object
    FormatMicroform
    Paginationii, 25 p.
    Number of Pages25
    ID Numbers
    Open LibraryOL13622713M
    OCLC/WorldCa38580778

Earthquakes as Research Subjects In Lect we talked about how people use earthquakes as a tool for exploring the global structure of the of my colleagues and friends at SIO study just the aspect of seismology. There is, of course, another broad class of seismology which deals with more local-scale issues. raphic changes can significantly affect gravity readings. Unless the target is in a flat, open area and the depth does not exceed about feet, the gravity method will probably not be practical. Seismic Methods - The seismic techniques consist of measuring the travel time required for a seis-mic wave generated at or near the. Reflection seismology (or seismic reflection) is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the Earth's subsurface from reflected seismic method requires a controlled seismic source of energy, such as dynamite or Tovex blast, a specialized air gun or a seismic vibrator, commonly known by the trademark . Large-scale seismic experiment provide some of the highest resolution image of crustal structure. In Southern California, there have been three major large-scale surveys which have produced important results: the trans-Sierra transect, and the LARSE I and II surveys across the San Gabriel Mts, north of Los Angeles.

Gravity collected on moving platforms has different angular velocities than the earth's for dynamic gravity Platform's velocity & heading One of the most critical parameters in typical surveys is the high accuracy needed in elevation control. Local gravity signatures reflecting the low-density fill were isolated from a smooth, regional field reflecting deep, intrabasement sources by a graphical cross-proftle procedure, which incorporated data from outcrops, drill holes, and seismic soundings, to define the regional field. At control points where fill. Using seismic data collected from the array deployment, as well as fault structure and gravity data, the researchers were able to surmise that the WNFZ and the nearby Franklin Fault are linked and form one continuous fault zone that is more than km long. Other researchers have previously linked the WNFZ with the Maacama Fault to the north. Experiments Cell and Molecular Space Biology Researchers conduct experiments that help develop an understanding of the ways cells (or parts of cells) function and respond to spaceflight. Our studies examine DNA function and structure, cellular and molecular changes, phenotypic changes to organisms, as well as the ability of eukaryotic cells to generate and maintain their .

Scale for Seismic Data Although seismic data can not image small-scale stratal units, it can image mid- to large-scale units Parasequences Bed Sets Parasequence Sets Sequences Beds Lamina Sets Lamina Sequence Sets The big advantage of seismic data is areal coverage 46 Time versus Depth sec m m.   Seismic full-waveform inversion (FWI) for imaging Earth’s interior was introduced in the late s. Its ultimate goal is to use all of the .   Fifteen minutes into a minute job interview for the $million overhaul of the long-troubled Portland Public Service Building, owner’s rep Mike Day threw a . The Ngendei Seismic refraction experiment at DSDP Hole B--ocean-bottom seismometer data and evidence for crustal and upper mantle anisotropy. Initial Reports of the Deep Sea Drilling Project. Vol. 91, pp.

Gravity data collected along the Los Angeles Regional Seismic Experiment (LARSE) and preliminary model of regional density variations in basement rocks, southern California by Victoria E. Langenheim Download PDF EPUB FB2

Abstract. The U.S. Geological Survey conducted a detailed gravity study along part of the Los Angeles Regional Seismic Experiment (LARSE) transect across the San Fernando Basin and Transverse Ranges to help characterize the structure underlying this area.

gravity measurements were collected along the transect and to augment regional coverage near. The U.S. Geological Survey conducted a detailed gravity study along part of the Los Angeles Regional Seismic Experiment (LARSE) transect across the San Fernando Basin and Transverse Ranges to help characterize the structure underlying this area.

gravity measurements were collected along the transect and to augment regional coverage near. Gravity data collected along the Los Angeles Regional Seismic Experiment (LARSE) and preliminary model of regional density variations in basement rocks, southern California Open-File Report Gravity data collected along the Los Angeles Regional Seismic Experiment (LARSE) and preliminary model of regional density variations in basement rocks, southern California.

u.s. geological survey gravity data collected along the los angeles regional seismic experiment (larse) and preliminary model of regional density variations in basement rocks, By Southern California, V.

Langenheim and R. Jachens. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. u.s. geological survey gravity data collected along the los angeles regional seismic experiment (larse) and preliminary model of regional density variations in basement rocks, Cached Download Links.

quake Center (SCEC) collected refraction and low-fold reflection data along a km-long corridor extending from the Santa Monica Mountains northward to the Si-erra Nevada.

This profile was part of the second phase of the Los Angeles Region Seismic Experiment (LARSE II). Chief imaging targets included sedimentary basins. The gravity data processing resulting in some maps were interpreted and modeled to precise the geometry of the dune reservoir and its substratum.

Results and discussion Gravity analysis. Gravity data consists of gravity value and were reduced using the International Gravity Formula. deep reflection data were collected on the Great Lakes in a joint U.S.-Canadian project (Behrendt and others, ). DETERMINATION OF EARTHQUAKE SOURCE PARAMETERS Earthquake data There are three basic sources of data used in earthquake studies: permanent regional seismic networks, temporary dense networks of portable seismographs, and.

Two sets of seismic data were used in this work (Fig. The Finnish Reflection Seismic Experiment – (FIRE) data consist of two profiles covering line-km in the study area and the High Resolution Reflection Seismics for Ore Exploration – (HIRE) data consist of seven profiles totaling line-km.

Gravity data collected along the Los Angeles regional seismic experiment (LARSE) and preliminary model of regional density variations in basement rocks, southern California (No. 96–). US Geological Survey Open File Report, p. Mogren, S., Al-Amri, A. M., Al-Damegh, K., Fairhead, D., Jassim, S., & Algamdi, A.

ALTM surveys and follow-on geologic investigations will provide essential data for assessment of regional earthquake hazards. ALTM data will also be used broadly by local agencies and others for land-use planning, assessment of landslide and flood hazards, watershed and fisheries management, and geologic mapping.

Langenheim V.E. and Jachens R.C., (), Gravity data collected along the Los Angeles regional seismic experiment (LARSE) and preliminary model of regional density variations in basement rocks, southern California, U.S. Geological Survey Open File Report, 96–, 25 p. Laske, G., Masters., G., Ma, Z., Pasyanos, M., ().

Alongside our seismic data acquisition capabilities, ARGAS has carried out several airborne gravity and gradiometry, Electro-Magnetic, and various other geophysical surveys in Saudi Arabia and the region to aide in exploring for Oil and Gas, minerals, and ground water resources.

The Los Angeles Regional Seismic Experiment (LARSE) was initiated to study the crustal structure and mechanical properties of faults in the Los Angeles region. Colocated with high-resolution seismic-refraction and reflection data are detailed gravity measurements and high-resolution aeromagnetic surveys.

Observations of earthquakes along such faults indicate that seismicity is highly concentrated within this fault damage zone. However, the long‐term influence of the fault damage zone on complete earthquake cycles, i.e., years to centuries, is not well understood.

Search gravity, bathymetric, magnetic, and seismic navigation data from to now. Antarctic airborne gravity data () Gravity Field Atlas of the Southern Ocean (; Report MGG-7) Downward-continued gravity, RMS gravity roughness and residual roughness of the world's ocean crust.

Dictionary of Gravity Terms. enhancement of gravity and magnetic data and how gravity and magnetic data can be integrated with exploration well data and seismic reflection data. These data are now freely available online in digital format from the US Geological Survey web site.

Introduction The NPRA was established in by President Harding and cov Data Acquisition The fold CDP production profile along the western boundary fence, walk-away noise tests, and the VSP/downhole surveys were acquired during April of A second trip during late September produced fold reflection data along lines 2 and 3.

The seismograph used to record data on both trips was a channel Geometrics. Mobil Oil Company released this 25 km line to be used at an SEG research workshop on Seismic inversion methods at the Los Angeles convention in Data acquired and processed by WesternGeco.

A furtkm of newly reprocessed legacy data also available, along with gravity and magnetics, and data from wells in the areas of interest. Gravity station data and hand-held magnetometer measurements with analysis and description of methodology.

Info: Gravity data along LARSE (Los Angeles Regional Seismic Experiment) line 2, southern California. Data taken across the San Fernando Basin and Transverse Ranges to help characterize the structure underlying this area.

Info. Onshore, the options are airborne or ground gravity data. In well explored areas, better gravity data should be available, as shown in Figure 3 from the Gjesvær Low in the south-western Barents Sea.

The almost triangular depression was identified as a prolongation of the salt-bearing Nordkapp Basin by gravity and only later confirmed by seismic. Gravity data along LARSE (Los Angeles Regional Seismic Experiment) line 2, southern California.

Data taken across the San Fernando Basin and Transverse Ranges to help characterize the structure underlying this area. Info: Preliminary potential-field constraints on the geometry of the San Fernando basin, southern California. Results of mathematical modeling of gravity and.

The data of the regional and PASSCAL seismometers were used in the last few years to obtain earthquake- and noise-based tomographic images with nominal horizontal resolution of 2–3 km over the depth interval 1–15 km (e.g.

Allam & Ben-Zion ; Zigone et al. ), finer-scale information on fault bimaterial interfaces and inner damage. • Seismic Refraction • Seismic Reflection data collection, they are often employed as the reconnaissance tools, used The data is collected along profiles and the results can be displayed in real-time with an attached computer display unit.

This leads to easy and fast. seismic data 7 history of seismic structure of icelandic crust 7 different contributions to the crustal structure model of krafla 9 p-wave-velocity-density systematics 11 density of icelandic rocks 14 5. gravity data 15 bouguer gravity map 16 gravity profile 17 interpretation of gravity anomalies and.

Comparing variations in gravity along the trenches with earthquake data from two different catalogs going back years, the team found that, within a given subduction zone, areas with negative gravity anomalies correlated with increased large earthquake activity.

Areas with relatively high gravity anomalies experienced fewer large earthquakes. U.S. Geological Survey–California Geological Survey fault-imaging surveys across the Hollywood and Santa Monica Faults, Los Angeles County, California.

We acquired multiple types of seismic data across the Hollywood Fault in Hollywood, Calif., and the Santa Monica Fault in Beverly Hills, Calif., in May and June Eight seismic horizons divide the Tertiary succession. Line location is shown in Figure 1. Dataset. The Paleogene-Neogene (Tertiary) interval is clearly imaged in more t line-kilometers of high-quality, fold 2D seismic data that were recently () acquired by GSI and donated to Memorial University for research.

Allegheny County / City of Pittsburgh / Western PA Regional Data Center — This dataset contains data on all Real Property parcels that have sold since in Allegheny County, PA.

Before doing any market analysis on property sales, check.- example: seismic waves are generated by an explosion 2.

Passive techniques - detect a naturally occurring signal - example: variations in gravity over a buried object Geophysical exploration techniques GEOPHYSICS 1. Seismic exploration (reflection and refraction) 2. Gravity exploration 3.

Magnetic exploration Common Applications.Gravity data are post-processed to obtain 1D, 2D and 3D models of the regional and residual Bouguer and Terrain-corrected gravity data. These can be presented as 3D Voxels and contour maps using Geosoft software applied by ClearView.