ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
Filter
  • Articles  (36)
Collection
Source
Publisher
Years
Journal
Topic
  • 1
    facet.materialart.
    Unknown
    Seismicity remotely triggered by the magnitude 7.3 landers, california, earthquake (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-06-11
    Description: The magnitude 7.3 Landers earthquake of 28 June 1992 triggered a remarkably sudden and widespread increase in earthquake activity across much of the western United States. The triggered earthquakes, which occurred at distances up to 1250 kilometers (17 source dimensions) from the Landers mainshock, were confined to areas of persistent seismicity and strike-slip to normal faulting. Many of the triggered areas also are sites of geothermal and recent volcanic activity. Static stress changes calculated for elastic models of the earthquake appear to be too small to have caused the triggering. The most promising explanations involve nonlinear interactions between large dynamic strains accompanying seismic waves from the mainshock and crustal fluids (perhaps including crustal magma).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hill, D P -- Reasenberg, P A -- Michael, A -- Arabaz, W J -- Beroza, G -- Brumbaugh, D -- Brune, J N -- Castro, R -- Davis, S -- Depolo, D -- Ellsworth, W L -- Gomberg, J -- Harmsen, S -- House, L -- Jackson, S M -- Johnston, M J -- Jones, L -- Keller, R -- Malone, S -- Munguia, L -- Nava, S -- Pechmann, J C -- Sanford, A -- Simpson, R W -- Smith, R B -- Stark, M -- Stickney, M -- Vidal, A -- Walter, S -- Wong, V -- Zollweg, J -- New York, N.Y. -- Science. 1993 Jun 11;260(5114):1617-23.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17810202" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    Seismic models of the root of the sierra nevada (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-12-05
    Description: Seismic waves generated by earthquakes or explosions show a delay in travel times as they propagate across the Sierra Nevada from all directions except that of the Nevada test site. Early arriving waves from the test site can be explained if they emerge through a rock layer with high seismic velocity from the sharp eastern edge of the Sierran root. Such a layer could be formed by the subducted ophiolite slab that crops out in the western Sierra Nevada foothills. A synthesis of all seismic data indicates that the Sierran root projects downward into the mantle to a depth of about 55 kilometers beneath the high Sierra.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pakiser, L C -- Brune, J N -- New York, N.Y. -- Science. 1980 Dec 5;210(4474):1088-94.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17831451" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    Strong ground motion from the michoacan, Mexico, earthquake (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-09-05
    Description: The network of strong motion accelerographs in Mexico includes instruments that were installed, under an international cooperative research program, in sites selected for the high potenial of a large earthquake. The 19 September 1985 earthquake (magnitude 8.1) occurred in a seismic gap where an earthquake was expected. As a result, there is an excellent descripton of the ground motions that caused the disaster.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, J G -- Bodin, P -- Brune, J N -- Prince, J -- Singh, S K -- Quaas, R -- Onate, M -- New York, N.Y. -- Science. 1986 Sep 5;233(4768):1043-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17746576" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 4
    facet.materialart.
    Unknown
    Seismic Study of an Oceanic Ridge Earthquake Swarm in the Gulf of California (1971)
    Oxford University Press
    Details
    Publication Date: 1971-05-01
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Royal Astronomical Society.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 5
    facet.materialart.
    Unknown
    Statistics of Ground Motions in a Foam Rubber Model of a Strike-Slip Fault (2015)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2015-06-09
    Description: The peak ground acceleration (PGA) and peak ground velocity (PGV) from 5058 ruptures of a foam rubber stick-slip model are not distributed according to a lognormal probability distribution function. PGA and PGV values are decomposed using the method of Anderson and Uchiyama (2011) . The statistically significant deviations from the lognormal distribution occur near the peak of the distribution. In some cases, high-amplitude tails differ by a much greater ratio, but the statistical significance of this effect is low. This result is true of both raw data and data adjusted for site and magnitude. Event terms are also not lognormal but can be modeled as a sum of three or four lognormal subdistributions, which possibly represent different preferred rupture initiation points rather than a uniform distribution of initiation points. The event term subdistributions with highest median values have small standard deviations, so if shapes of this nature were used in ground-motion prediction equations (GMPEs) during a probabilistic seismic-hazard analysis, the effect of the long tail of the lognormal distribution in controlling the hazard would be weakened considerably. Static stress drop was recorded for each event, and event terms for PGA and PGV are well correlated with static stress drop. Unlike Next Generation Attenuation-West 2 GMPEs, residual variances for the foam model are dominated by variability in the source slip function, rather than the path and site effects. This difference in the variance budget results from the way in which the source and site residuals are defined in this study; the source uncertainty includes variation in the rupture size (magnitude) and location, along with deviations in distance and path. We do not know if these results apply to earthquakes, but we do think tests of repeating stick-slip events in a physical system are useful to expand the set of credible hypotheses regarding possible behavior modes of earthquake faults.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 6
    facet.materialart.
    Unknown
    Ground Motions in the Fukushima Hamadori, Japan, Normal-Faulting Earthquake (2013)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2013-06-08
    Description: A crustal normal-faulting earthquake ( ; M w  6.7) occurred in eastern Tohoku, Japan, on 11 April 2011. K-NET and KiK-net stations recorded 82 records from within 100 km of fault rupture. These data and data from associated foreshocks and aftershocks will make a critical contribution to future improvements of ground-motion prediction for normal-faulting earthquakes. Peak ground accelerations (PGA) and peak ground velocities (PGV) are compared with four ground-motion prediction equations (GMPEs) that include the style of faulting as a predictor parameter. For distances under 100 km, and using a network average value of V S 30 , the average ratio of PGA to the selected GMPEs (the event term ) is high by factors of 2.3–3.7. Event terms for PGV are high by factors of 1.4–1.8. Adjusting PGA and PGV with customized site terms ( Kawase and Matsuo, 2004a , b ), the standard deviations of PGA and PGV residuals are reduced from 0.59 to 0.43, and from 0.53 to 0.35, respectively. The event terms decreased to relatively small factors of 1.1–1.8 for PGA and increased slightly to 1.5–2.0 for PGV. Thus, site terms are very important, but positive event terms remain. The remaining positive event terms are not explained by high stress drop, which was typical of crustal events of all mechanisms globally or in Japan. Two subparallel faults ruptured, but source inversions, which we reviewed, revealed that they ruptured sequentially, so simultaneous contributions from the two faults did not cause high motions. Although these observations may tend to suggest that ground motions in large normal-faulting events are larger than predicted by the tested models, we are not aware of any observations from this event that contradict the precarious rock evidence of Brune (2000) that ground shaking is low on the footwall near the rupture.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 7
    facet.materialart.
    Unknown
    The Effects of Fault Stepovers on Ground Motion (2013)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2013-06-08
    Description: Using 3D dynamic models, we investigate the effect of fault stepovers on near-source ground motion. We use the finite-element method to model the rupture, slip, and ground motion of two parallel strike-slip faults with an unlinked overlapping stepover of variable width. We model this system as both an extensional and a compressional stepover and compare the results to those of single planar faults. We find that, overall, the presence of a stepover along the fault trace reduces the maximum ground motion when compared to the long planar fault. Whether the compressional or extensional stepover exhibits higher ground motion overall depends on the width of the separation between the faults. There is a region of reduced ground motion at the end of the first fault segment, when the faults are embedded in a homogeneous material. We also experiment with stress fields leading to supershear and subshear rupture velocities, and with different stress drops within those conditions. We find that subshear rupture produces stronger motions than supershear rupture, but supershear ruptures produce that maximum over a larger area than subshear areas, even though the overall area that experiences any shaking at all is not drastically different between the two cases. Lastly, we experiment with placing realistic materials along and around the faults, such as a sedimentary basin in an extensional stepover, a damage zone around the fault, and a soft rock layer on top of bedrock through the entire model area. These configurations alter the pattern of ground motion from the homogeneous case; the peaks in ground motion for the bimaterial cases depend on the materials in question. The results may have implications for ground-motion prediction in future earthquakes on geometrically complex faults. Online Material: MPEG-4 movies of models of dynamic rupture of fault stepovers embedded in heterogeneous material settings.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 8
    facet.materialart.
    Unknown
    Rupture Propagation and Ground Motion of Strike-Slip Stepovers with Intermediate Fault Segments (2015)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2015-01-30
    Description: Field studies of historic rupture traces show that fault stepovers commonly serve as endpoints to earthquake ruptures. This is an effect that is corroborated by past dynamic modeling studies. However, field studies also show a great deal of complexity in fault-zone structure within a stepover, which is often simplified out of modeling studies. In the present study, we use the 3D finite-element method to investigate the effect of one type of smaller-scale complexity on the rupture process: a smaller fault segment positioned between the two primary strands of a strike-slip fault stepover. We find that such small faults can have a controlling effect on whether or not a rupture is able to jump the stepover and on the resulting ground motions from these ruptures. However, this effect is neither straightforward nor linear: the length of the intermediate segment and its basal depth, as well as whether the stepover is extensional or compressional, all contribute to the rupture behavior and ground-motion distribution. These results have important implications for assessing the probability of a rupture propagating through small- and large-scale discontinuities in faults, as well as for evaluating ground-motion intensities near fault stepovers. Because of the sensitivity of results to so many parameters, these results also suggest that modeling studies on idealized fault geometries may not be sufficient to describe the rupture behaviors of specific complex fault systems. Site-specific modeling studies, where possible, will provide better inputs and constraints for probabilistic rupture length assessments as well as for ground-motion estimates.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 9
    facet.materialart.
    Unknown
    Constraints on Ground Accelerations Inferred from Unfractured Hoodoos near the Garlock Fault, California (2013)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2013-02-07
    Description: In the absence of long-term instrumental data, the presence of fragile geologic features near active faults can provide physical limits on the level of ground shaking that could potentially have significant implications for seismic hazards. This paper introduces a multidisciplinary investigation that uses unfractured hoodoos in seismically active regions to constrain the level of ground accelerations at those locations. Although there is a large uncertainty associated with the age of the hoodoos because of their rapidly eroding nature, they can still be useful in providing physical limits on ground motions associated with recent large events. Here, we consider the fragilities of two hoodoos in the Red Rock Canyon region within a few kilometers of the Garlock fault, which is an active strike-slip fault in a transtensional region with at least a few large earthquakes in the Holocene. The hoodoos at these sites could be evidence of median or relatively low ground motions associated with large transtensional strike-slip earthquakes. Results of our field and laboratory tests on two hoodoos provide constraints on peak ground accelerations (PGAs) of and . Using the U.S. Geological Survey’s (USGS) probabilistic seismic hazard (PSH) deaggregation, the dominant earthquake contributing to the hazard at the site of the hoodoos for the recurrence intervals of 475, 975, and 2475 years is located at a distance of 4.8 km and has a magnitude of 7.63, consistent with the observed paleoearthquake evidence on the Garlock fault. The PGAs corresponding to these three return periods are 0.26, 0.40, and , respectively. Therefore, the survival of the more fragile hoodoo during a presumably large event on the Garlock fault in the past 550 years would be consistent with the 2008 seismic hazard level if the ground motions during that event were below the median value.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Low Footwall Accelerations and Variable Surface Rupture Behavior on the Fort Sage Mountains Fault, Northeast California (2013)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2013-02-07
    Description: The Fort Sage Mountains fault zone is a normal fault in the Walker Lane of the western Basin and Range that produced a small surface rupture (〈20 cm) during an M L  5.6 earthquake in 1950. We investigate the paleoseismic history of the Fort Sage fault and find evidence for two paleoearthquakes with surface displacements much larger than those observed in 1950. Rupture of the Fort Sage fault ~5.6 ka resulted in surface displacements of at least 0.8–1.5 m, implying earthquake moment magnitudes ( M w ) of 6.7–7.1. An older rupture at ~20.5 ka displaced the ground at least 1.5 m, implying an earthquake of M w  6.8–7.1. A field of precariously balanced rocks (PBRs) is located less than 1 km from the surface-rupture trace of this Holocene-active normal fault. Ground-motion prediction equations (GMPEs) predict peak ground accelerations (PGAs) of 0.2–0.3 g for the 1950 rupture and 0.3–0.5 g for the ~5.6 ka paleoearthquake one kilometer from the fault-surface trace, yet field tests indicate that the Fort Sage PBRs will be toppled by PGAs between 0.1–0.3 g . We discuss the paleoseismic history of the Fort Sage fault in the context of the nearby PBRs, GMPEs, and probabilistic seismic hazard maps for extensional regimes. If the Fort Sage PBRs are older than the mid-Holocene rupture on the Fort Sage fault zone, this implies that current GMPEs may overestimate near-fault footwall ground motions at this site.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...