ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Series available for loan
    Series available for loan
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Call number: S 90.0003(1184)
    In: U.S. Geological Survey circular
    Type of Medium: Series available for loan
    Pages: V, 19 S.
    ISBN: 0607926368
    Series Statement: U.S. Geological Survey circular 1184
    Classification: A.3.12.
    Location: Lower compact magazine
    Branch Library: GFZ Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1420-9136
    Keywords: Earthquake stress drops ; Plate tectonics ; Stress in lithosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A variety of geophysical observations suggests that the upper portion of the lithosphere, herein referred to as the elastic plate, has long-term material properties and frictional strength significantly greater than the lower lithosphere. If the average frictional stress along the non-ridge margin of the elastic plate is of the order of a kilobar, as suggested by the many observations of the frictional strength of rocks at mid-crustal conditions of pressure and temperature, the only viable mechanism for driving the motion of the elastic plate is a basal shear stress of several tens of bars. Kilobars of tectonic stress are then an ambient, steady condition of the earth's crust and uppermost mantle. The approximate equality of the basal shear stress and the average crustal earthquake stress drop, the localization of strain release for major plate margin earthquakes, and the rough equivalence of plate margin slip rates and gross plate motion rates suggest that the stress drops of major plate margin earthquakes are controlled by the elastic release of the basal shear stress in the vicinity of the plate margin, despite the existence of kilobars of tectonic stress existing across vertical planes parallel to the plate margin. If the stress differences available to be released at the time of faulting are distributed in a random, white fasbion with a mean-square value determined by the average earthquake stress drop, the frequency of occurrence of constant stress drop earthquakes will be proportional to reciprocal faulting area, in accordance with empirically known frequency of occurrence statistics.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 237 (1972), S. 387-388 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Assuming the Earth accreted uniformly with respect to composition 4.5 x 104 yr ago, we have concluded that core formation could have been simultaneous with the accretion process3. The initial temperatures necessary to lead to core formation, together with the temperature rise on core formation, ...
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 1987-06-01
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Publication Date: 1991-10-01
    Description: This article examines how the empirical Green's function seismogram synthesis method might perform as a tool for earthquake hazard analysis by "predicting" strong ground motion from the 18 October 1989 Loma Prieta earthquake. A suite of accelerograms are synthesized for five sites 40 to 80 km from the nearest fault rupture from 25 different source models that might have been considered prior to the occurrence of the Loma Prieta earthquake. Three-component, full wavetrain ground accelerations are synthesized over the frequency range of 0.5 to 25.0 Hz with a sparse distribution of source events for empirical Green's functions and fairly simple source models. The suite of source models includes a range of rupture histories and geometries, asperity models, and slip models that reflect the uncertainties both in predicting the actual rupture history and in knowledge of modeling rupture processes. The suite of synthesized accelerograms includes a good match to observed time series amplitudes, frequency content, energy distribution, and some waveforms and demonstrates that the character of actual time series can be captured with a range of simple source models. The average levels of peak acceleration, pseudo-velocity response, and Fourier amplitude spectra provide a good prediction to the observed values at four of the five sites. The log-normal standard deviations provide bounds on the predictions that are specific to the source and recording site.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Publication Date: 1991-10-01
    Description: This article focuses on an engineering evaluation of the ground motions recorded during the Loma Prieta earthquake. Regression analysis is employed to evaluate the attenuation characteristics of the elastic and inelastic strength demands imposed by rock and alluvium ground motions on bilinear single degree of freedom (SDOF) systems. Several records are used to illustrate the large seismic demands generated by soft soil ground motions. Strength capacities of modern code-designed structures are compared to the strength demands in order to assess the damage potential of the Loma Prieta ground motions. The Cypress structure is used as an example to illustrate the application of simple demand / capacity concepts for an evaluation of structural performance.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Publication Date: 1991-10-01
    Description: This article describes analytical studies performed to explain the collapse of the Cypress Street Viaduct. The modes of failure of four types of bents are described. A strength analysis is presented, which gives estimates of the forces that were necessary to produce the failure of these bents. These estimates are computed based on the observed failure mechanism of each type of bent, on measured mechanical characteristics of the materials, and on simplified structural models. The overstrength of these bents, above the level of forces for which they were designed, is evaluated. Levels of acceleration required to produce the failure are given. From comparison of these levels of accelerations with those resulting from the elastic as well as the inelastic response spectra corresponding to ground motions recorded near the Viaduct, it is concluded that the demanded shear strength was considerably higher than the supplied strength and that bent type B8 was the weakest one and where the failure was probably initiated.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Publication Date: 1991-10-01
    Description: Aftershocks of the 18 October 1989 Loma Prieta, California, earthquake are located using S-P arrival-time measurements from stations of the PASSCAL aftershock deployment. We demonstrate the effectiveness of using S-P arrival-time data in locating earthquakes recorded by a sparse three-component network. Events are located using the program QUAKE3D (Nelson and Vidale, 1990) with both 2-D and 3-D velocity models that have been developed independently for this region. The dense coverage of the area around the Loma Prieta rupture zone by instruments of the California Network (CALNET) has allowed the U.S. Geological Survey (USGS) to find P-wave earthquake locations for both velocity models, which we compare with our solutions. We also perform synthetic calculations to estimate realistic location errors resulting from uncertainties in both the 3-D velocity structure and the timing of arrivals. These calculations provide a comparison of location accuracies obtained using S-P arrival times, S and P arrival times, and P times alone. We estimate average absolute errors in epicentral location and in depth for the Loma Prieta aftershocks to be just under 2 km and 1 km, respectively, using S-P phase data and the sparse PASSCAL instrument coverage. The synthetic tests show that these errors are much smaller than those predicted using P-wave data alone and are nearly the same as those predicted using S- and P-phase data separately. This suggests that future aftershock recording deployments with sparse networks of three-component data can retrieve accurate event locations even if absolute timing is problematic. We find moderate differences between our locations and those determined by the USGS from a larger network of stations; however, common characteristics in both seismicity patterns are apparent. Neither set of locations yields earthquake patterns that can be easily interpreted in terms of simple faulting geometries. The absence of a simple pattern in both sets of earthquake locations indicates that this complexity is not the result of earthquake mislocation but is a genuine feature of the seismicity. A deep southwesterly dipping plane and a near-vertical fault extending from the surface to at least 7-km depth beneath the surface trace of the San Andreas Fault are imaged by both sets of earthquake locations.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Publication Date: 1991-10-01
    Description: A Board of inquiry was appointed by the Governor of California to investigate the damage, particularly to bridges and freeway structures, caused by the 1989 Loma Prieta earthquake. The Governor wanted to know not only what happened, but how to prevent such destruction in the future. The Board identified three essential challenges that must be addressed by the citizens of California, if they expect a future adequately safe from earthquakes: (1) ensure that earthquake risks posed by new construction are acceptable; (2) identify and correct unacceptable seismic safety conditions in existing structures; and (3) develop and implement actions that foster the rapid, effective, and economic response to and recovery from damaging earthquakes. The Governor issued an Executive Order implementing the principal Board recommendations that all state-owned and -operated structures are to be seismically safe and that important structures are to maintain their function after earthquakes. The Seismic Safety Commission has evaluated the response of state agencies to the Order and found performance generally to be good, but variable. Inadequate funding is the most serious and the most difficult for the agencies to address internally, as are legislative capital budgeting processes that are cumbersome. Agencies were encouraged to identify single administrators responsible for seismic safety to assure management accountability, rather than the generally diffuse responsibility found in most agencies. The Board, Governor, and Commission all concluded that, while much progress has been made during the past two decades in reducing earthquake risks, much more awaits doing. More aggressive efforts to mitigate the consequences of future, certain earthquakes are needed if one of the most fundamental of responsibilities of government is to be fulfilled-to provide for the public safety.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Publication Date: 1991-10-01
    Description: Strong motion records of the 1989 Loma Prieta earthquake are inverted to determine a model of the rupture history. Uncorrected horizontal and vertical accelerograms are integrated to particle velocity time histories for 38 stations within an epicentral range of 75 km. The time histories are bandpassed filtered with corners at 0.05 and 1.0 Hz. These bandpassed time histories are inverted using a nonlinear method to solve for the distribution of slip amplitudes and rupture times at specified locations on the fault plane. The fault plane is specified a priori: 38 km long and 17 km wide, extending from 3 to 19 km depth at a constant dip of 70 degrees . Starting models have rupture times based on constant rupture velocities of 2.5, 2.8, and 3.0 km/sec and uniform slip with rise times of 0.5, 1.0, 1.5, and 3.0 sec. The waveform inversion results show the strike-slip displacement is concentrated at the southern end of the rupture (rake = 1 56 degrees and the dip-slip displacement is concentrated at the northern end of the rupture (rake = 115 degrees ). The average total slip is partitioned almost equally between strike slip and dip slip (rake = 137 degrees ). The hypocentral area has an unusually small amount of slip with almost no slip in a region just to the north and up dip from the hypocenter. The rupture front is complex, propagating up dip to the south faster than it propagates to the north. The region of maximum strike slip to the southeast radiates simultaneously with the region of maximum dip slip to the northwest. The average rupture velocity is 3.0 km/sec, approximately 0.83 times the local shear wave speed. The calculated seismic moment is 3.5+ or -0.5X10 (super 26) dyne-cm.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...