GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Microseismicity induced by a controlled, mine collapse at White Pine, Michigan
    Elsevier BV ; 1997
    In:  International Journal of Rock Mechanics and Mining Sciences Vol. 34, No. 3-4 ( 1997-04), p. 246.e1-246.e14
    Details
    In: International Journal of Rock Mechanics and Mining Sciences, Elsevier BV, Vol. 34, No. 3-4 ( 1997-04), p. 246.e1-246.e14
    Type of Medium: Online Resource
    ISSN: 1365-1609
    URL: Article
    DOI: 10.1016/S1365-1609(97)00230-X
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1997
    detail.hit.zdb_id: 2016557-2
    SSG: 19,1
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    The Oroville earthquake sequence of August 1975
    Seismological Society of America (SSA) ; 1976
    In:  Bulletin of the Seismological Society of America Vol. 66, No. 4 ( 1976-08-01), p. 1065-1084
    Details
    In: Bulletin of the Seismological Society of America, Seismological Society of America (SSA), Vol. 66, No. 4 ( 1976-08-01), p. 1065-1084
    Abstract: The characteristics of the Oroville, California earthquake sequence of 1975 are presented. Historically, the Oroville area is one of low seismicity; the largest earthquake in the region occurred with a magnitude (ML) 5.7 in 1940 some 50 km north of Oroville. The first foreshock of the sequence occurred on June 28, 1975. Twnety-one foreshocks (ML ≧ 1.6), the largest of magnitude 4.7, preceded the magnitude 5.7 main shock of August 1. All foreshocks and aftershocks of ML ≧ 3.0 were located using seismographs operated by the University of California at Berkeley, USGS, and the California Department of Water Resources. The aftershock region covers an area approximately 14 by 10 km southeast of the city of Oroville. The depth distribution of the earthquakes indicates a west dipping fault plane. The b value of 0.61 shows the sequence to be rich in larger magnitude aftershocks. Similar b values have been determined for other aftershock sequences in California, such as a sequence near Coalinga in August 1975. The aftershock occurrence rate follows an Omori relation with n(t∞t−0.70. Apparent variability in the earthquake mechanisms of the series makes interpretation of composite fault-plane solutions difficult, but the data indicate normal faulting striking NNW and a west dip of about 30°–40°, the Sierra Nevada moving up with respect to the Great Valley.
    Type of Medium: Online Resource
    ISSN: 1943-3573 , 0037-1106
    URL: Article
    DOI: 10.1785/BSSA0660041065
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 1976
    detail.hit.zdb_id: 2065447-9
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Aftershocks of an explosively induced mine collapse at White Pine, Michigan
    Seismological Society of America (SSA) ; 1999
    In:  Bulletin of the Seismological Society of America Vol. 89, No. 6 ( 1999-12-01), p. 1575-1590
    Details
    In: Bulletin of the Seismological Society of America, Seismological Society of America (SSA), Vol. 89, No. 6 ( 1999-12-01), p. 1575-1590
    Abstract: We recorded an explosively induced, 320-m-deep mine collapse and subsequent aftershocks at White Pine, Michigan, using an array of 12 seismic stations, sited within 1 km of surface ground zero. The collapse, which followed the rubblizing of a 2 × 104 m2 panel of a room-and-pillar copper mine, was induced to facilitate leaching operations. The explosions produced little seismic energy; however, fracturing and collapse stages produced large signals that were observed at distances up to 900 km, yielding a magnitude (mbLg) of 2.8. Previous work showed the initial collapse to be an expanding seismic source, interpreted as an opening tensile crack, opposite to the implosional character most often observed for natural mine collapses (Yang et al., 1998). We counted over 4000 aftershocks; their occurrence rate followed the modified Omori law: rate = 560 (time − 0.01)−1.3, with time in hours. Based on P-wave polarities, we identified events of shear-slip, implosional, and tensile character in the aftershock sequence. For shear-slip events, we found stress drops of 1 bar or less, seismic moments of 1015−1017 dyne cm, (Mw−0.8−0.5) and source radii of 10-50 m. Corner frequencies for implosional events were relatively low, an indication that the collapsed cavity played a role in the source process. This caused implosional events to separate from other events in source parameter plots, providing a technique for classifying events of unknown type. We obtained locations of 135 aftershocks using P- and S-wave data. The aftershock zone was less than 100-m thick, situated just above and along the western, mined edge of the collapsed mine panel. Implosional events occurred at the bottom of the active volume, while shear-slip events were distributed throughout. Shear-slip focal mechanisms indicated thrusting along north-striking planes, consistent with the high, eastwest regional compressive stress, coupled with a local decrease in vertical stress. The inferred deficit of vertical stress above the western panel edge following collapse indicated that overburden load shifted preferentially to the surrounding, unmined areas, consistent with lower-than-predicted stresses measured in the first row of intact pillars.
    Type of Medium: Online Resource
    ISSN: 1943-3573 , 0037-1106
    URL: Article
    DOI: 10.1785/BSSA0890061575
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 1999
    detail.hit.zdb_id: 2065447-9
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Experimental characterization of seasonal variations in infrasonic traveltimes on the Korean Peninsula with implications for infrasound event location : Seasonal variations in infrasonic traveltimes
    Oxford University Press (OUP) ; 2011
    In:  Geophysical Journal International Vol. 185, No. 1 ( 2011-04), p. 190-200
    Details
    In: Geophysical Journal International, Oxford University Press (OUP), Vol. 185, No. 1 ( 2011-04), p. 190-200
    Type of Medium: Online Resource
    ISSN: 0956-540X
    URL: Issue
    URL: Article
    DOI: 10.1111/gji.2011.185.issue-1
    DOI: 10.1111/j.1365-246X.2011.04948.x
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2011
    detail.hit.zdb_id: 3042-9
    detail.hit.zdb_id: 2006420-2
    detail.hit.zdb_id: 1002799-3
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Effect of time-varying tropospheric models on near-regional and regional infrasound propagation as constrained by observational data
    American Geophysical Union (AGU) ; 2008
    In:  Journal of Geophysical Research Vol. 113, No. D11 ( 2008-06-07)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 113, No. D11 ( 2008-06-07)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2007JD009130
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
    detail.hit.zdb_id: 2033040-6
    detail.hit.zdb_id: 3094104-0
    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Higher-degree moment tensors ? the importance of source finiteness and rupture propagation on seismograms
    Oxford University Press (OUP) ; 1982
    In:  Geophysical Journal International Vol. 69, No. 3 ( 1982-06), p. 721-743
    Details
    In: Geophysical Journal International, Oxford University Press (OUP), Vol. 69, No. 3 ( 1982-06), p. 721-743
    Type of Medium: Online Resource
    ISSN: 0956-540X , 1365-246X
    URL: Issue
    URL: Article
    DOI: 10.1111/gji.1982.69.issue-3
    DOI: 10.1111/j.1365-246X.1982.tb02772.x
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 1982
    detail.hit.zdb_id: 3042-9
    detail.hit.zdb_id: 2006420-2
    detail.hit.zdb_id: 1002799-3
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    Quantification and characterization of regional seismic signals from cast blasting in mines: a linear elastic model
    Oxford University Press (OUP) ; 1997
    In:  Geophysical Journal International Vol. 131, No. 1 ( 1997-10), p. 45-60
    Details
    In: Geophysical Journal International, Oxford University Press (OUP), Vol. 131, No. 1 ( 1997-10), p. 45-60
    Type of Medium: Online Resource
    ISSN: 0956-540X , 1365-246X
    URL: Issue
    URL: Article
    DOI: 10.1111/gji.1997.131.issue-1
    DOI: 10.1111/j.1365-246X.1997.tb00594.x
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 1997
    detail.hit.zdb_id: 3042-9
    detail.hit.zdb_id: 2006420-2
    detail.hit.zdb_id: 1002799-3
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    Stress-Drop Estimates for Induced Seismic Events in the Fort Worth Basin, Texas
    Seismological Society of America (SSA) ; 2021
    In:  Bulletin of the Seismological Society of America Vol. 111, No. 3 ( 2021-06-01), p. 1405-1421
    Details
    In: Bulletin of the Seismological Society of America, Seismological Society of America (SSA), Vol. 111, No. 3 ( 2021-06-01), p. 1405-1421
    Abstract: Earthquakes in the Fort Worth basin (FWB) have been induced by the disposal of recovered wastewater associated with extraction of unconventional gas since 2008. Four of the larger felt earthquakes, each on different faults, prompted deployment of local distance seismic stations and recordings from these four sequences are used to estimate the kinematic source characteristics. Source spectra and the associated source parameters, including corner frequency, seismic moment, and stress drop, are estimated using a modified generalized inversion technique (GIT). As an assessment of the validity of the modified GIT approach, corner frequencies and stress drops from the GIT are compared to estimates using the traditional empirical Green’s function (EGF) method for 14 target events. For these events, corner-frequency residuals (GIT−EGF) have a mean of −0.31 Hz, with a standard deviation of 1.30 Hz. We find consistent mean stress drops using the GIT and EGF methods, 9.56 and 11.50 MPa, respectively, for the common set of target events. The GIT mean stress drop for all 79 earthquakes is 5.33 MPa, similar to estimates for global intraplate earthquakes (1–10 MPa) as well as other estimates for induced earthquakes near the study area (1.7–9.5 MPa). Stress drops exhibit no spatial or temporal correlations or depth dependency. In addition, there are no time or space correlations between estimated FWB stress drops and modeled pore-pressure perturbations. We conclude that induced earthquakes in the FWB occurring on normal faults in the crystalline basement release pre-existing tectonic stresses and that stress drops on the four sequences targeted in this study do not directly reflect perturbations in pore-fluid pressure on the fault.
    Type of Medium: Online Resource
    ISSN: 0037-1106 , 1943-3573
    URL: Article
    DOI: 10.1785/0120200268
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 2021
    detail.hit.zdb_id: 2065447-9
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    Source parameter estimation for large, bermed, surface chemical explosions
    Seismological Society of America (SSA) ; 1992
    In:  Bulletin of the Seismological Society of America Vol. 82, No. 1 ( 1992-02-01), p. 406-421
    Details
    In: Bulletin of the Seismological Society of America, Seismological Society of America (SSA), Vol. 82, No. 1 ( 1992-02-01), p. 406-421
    Abstract: Near-source accelerograms (0.2 to 2.0 km range) were acquired from a series of bermed surface charges (0.075 to 1.65 kilotons) detonated in alluvium at a test site near Yuma, Arizona. The areal extent of the explosion test beds (radii from 18 to 54 m) affords the unique opportunity to study wave propagation from and source parameters of large surface explosions at near-source ranges. P and SV-Rayleigh phases are identified using particle motions. Rayleigh waves at an intermediate range transition to a combination of higher mode and fundamental mode Rayleigh waves at the farthest range. The power law decay rates for body waves (radial at r−1.8 and vertical at r−1.4) and surface waves (radial at r−1.0 and vertical at r−0.8) are further indication of complex propagation effects in the shallow alluvial geology. As a result of this complexity and the two-orders-of-magnitude range of explosive yields available, seismic source parameters are obtained with full-waveform spectral ratios. Source corner frequency is proportional to the radius of the explosion test beds and long-period-level (relative moment) scales linearly with yield. Spectral ratio yield estimates using smaller explosions as standard or calibration events gave absolute yield estimates within 6 to 35% of the true yield with a linear scaling law. The precision of individual yield estimates is reflected by multiplicative errors of 1.11 to 1.17. Full-waveform spectral ratio corner frequency estimates compare favorably with reglonal P-wave corner frequencies and validate the use of the spectral ratio technique for near-source seismic data.
    Type of Medium: Online Resource
    ISSN: 1943-3573 , 0037-1106
    URL: Article
    DOI: 10.1785/BSSA0820010406
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 1992
    detail.hit.zdb_id: 2065447-9
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 10
    Online Resource
    Online Resource
    Constraints on explosive sources with spall from near-source waveforms
    Seismological Society of America (SSA) ; 1985
    In:  Bulletin of the Seismological Society of America Vol. 75, No. 2 ( 1985-04-01), p. 361-377
    Details
    In: Bulletin of the Seismological Society of America, Seismological Society of America (SSA), Vol. 75, No. 2 ( 1985-04-01), p. 361-377
    Abstract: Spall, the tensile failure of a material due to high stress loading, has been observed in a number of contained and surface explosions. The phenomenon results in a repartition of the initial spherical explosion energy source, yielding a second energy source which is cylindrical and delayed in time. Recent spall models by Day et al. (1983) demanding conservation of momentum have shown the phenomenon to have little contribution to 20-sec surface waves. These models are extended to include the effect of the process on near-source seismograms. The spall model is constrained by observations within the nonlinear regime of the source which bound the mass, momentum, and timing of the process. Comparison of these forward models with the inverse vertical point force source inferred from seismic recordings of a bermed surface explosion yields excellent agreement. The spall model developed from the contained explosion, CHEAT, is used to create synthetic seismograms. Comparisons of these waveforms with those from a Mueller-Murphy contained explosion indicate that the waveform contribution from spall is similar in size to the spherical explosion waveform. The complete synthetic composed of the spall and explosion contribution compares favorably with observational data from the CHEAT experiment in both amplitude and energy distribution.
    Type of Medium: Online Resource
    ISSN: 1943-3573 , 0037-1106
    URL: Article
    DOI: 10.1785/BSSA0750020361
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 1985
    detail.hit.zdb_id: 2065447-9
    SSG: 16,13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...