The New IASPEI Manual of Seismological Observatory Practice

Bormann, Peter; Bergman, Eric

doi:10.1785/gssrl.71.5.510

Cited by 120 publications

(172 citation statements)

References 2 publications

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“…There are many categories of spectrum users in, so to say, seismic society, Bormann [3]. Spectrum tools are closely related to dedicated computer software, which often yields readymade results, hiding the calculation details.…”

Section: Resultsmentioning

confidence: 99%

“…Depending on its source, there are several categories of seismic signals, Bormann et al [8], Lee et al [9], Kostrov and Das [10]. Propagation of seismic waves through the Earth strongly adds to intrinsic waveform complexity [9], Bormann, Engdahl and Kind [11]. Being such, spectrum of seismic signal (i.e.…”

Section: Seismic Signal In Periodic Formmentioning

confidence: 99%

“…We simply tailor repeating pulses taking a packet waveform as a basic period, relying on similarity of edge fluctuations in amplitude and slope [22], Havskov and Ottemoller [23]. Obviously, it would involve subjective factor, as in windowing, but we think it is much more natural approach, more based on variations itself in the waveform, and broadly includes reseacher's experience, very desirable in seismic analysis, Bormann [3]. We hope that this approach would be helpful as addition to related methods 24 of seismic analysis.…”

Section: Seismic Signal In Periodic Formmentioning

confidence: 99%

“…Seismogram analysts and station operators should possess capabilities to "understand each wiggle" in a seismic record, Bormann [3], especially in unusual cases. Similar thing holds for some researchers and engineers facing seismic factors in their work.…”

Section: Introductionmentioning

confidence: 99%

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New aspect of transition between line and continuous spectrum and its relation to seismic influence on structures

Babić¹,

Babić²,

Jakšić³

2018

Scientia Iranica

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Abstract:We considered a new view on transition process from periodic to aperiodic signals, in time and spectral domains, pointing out how the concept of infinity is involved. It contributes to better understanding of the nature of both spectral descriptions, and conditions of their practical use, particularly in unusual cases. There we highlight the invariance in spectrum convergence by introducing some numerical parameters which exactly describe such process. Their behaviour is numerically examined to detail. Also, we considered the opposite transition, from aperiodic to periodic, to clarify the meaning of spectral line. To suggest applicability of our analysis we used an actual seismic signal. By extracting the most prominent waveform part, regarding influence on structures, we formed a periodic signal which line spectrum can clearly show possible resonance with vibrating tones of structures.

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Section: Resultsmentioning

confidence: 99%

Section: Seismic Signal In Periodic Formmentioning

confidence: 99%

Section: Seismic Signal In Periodic Formmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New aspect of transition between line and continuous spectrum and its relation to seismic influence on structures

Babić¹,

Babić²,

Jakšić³

2018

Scientia Iranica

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“…Filters commonly used in seismic data loggers conform closely to this ideal behavior, in that they begin to attenuate the signal at frequencies of around 0.8-0.95 times the Nyquist frequency, and by the Nyquist have attenuation factors of 36 to 240 db/octave [Bormann, 2002]. For a signal originally recorded at 2 second intervals, averaged over a 120 second period and output at 120 s intervals, the Nyquist frequency of the output is 1/240 s or 0.0042 Hz.…”

Section: Discussionmentioning

confidence: 95%

Analysis of tide gauge records from the December 2004 Indian Ocean tsunami

Leonard

2006

Geophysical Research Letters

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I analyze records of the tsunami caused by the 2004 Sumatra – Andaman M9.3 earthquake from tide gauges, seismic stations and satellites, in the central Indian Ocean. I demonstrate that the tide gauge records with sampling intervals of 4 minutes or more are seriously aliased and under‐sample the tsunami waveform. Care needs to be taken when using this data for modeling this or future tsunami. The 1 minute sampling interval data accurately record the main features of the tsunami. The tsunami had significant energy at periods shorter than 1 minute and this resulted in, probably minor, aliasing of the 1 minute data. It is suggested that tide gauges intended for monitoring of tsunami use a sampling interval of at most 60 seconds, with effective anti aliasing filters being applied. Where the data is to be used for modeling at least 4 samples per minute data should be recorded.

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Aftershocks of the 2010 M_w 7.2 El Mayor‐Cucapah earthquake reveal complex faulting in the Yuha Desert, California

et al. 2013

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[1] We detect and precisely locate over 9500 aftershocks that occurred in the Yuha Desert region during a 2 month period following the 4 April 2010 M w 7.2 El Mayor-Cucapah (EMC) earthquake. Events are relocated using a series of absolute and relative relocation procedures that include Hypoinverse, Velest, and hypoDD. Location errors are reduced to 40 m horizontally and 120 m vertically. Aftershock locations reveal a complex pattern of faulting with en echelon fault segments trending toward the northwest, approximately parallel to the North American-Pacific plate boundary and en echelon, conjugate features trending to the northeast. The relocated seismicity is highly correlated with published surface mapping of faults that experienced triggered surface slip in response to the EMC main shock. Aftershocks occurred between 2 km and 11 km depths, consistent with previous studies of seismogenic thickness in the region. Three-dimensional analysis reveals individual and intersecting fault planes that are limited in their along-strike length. These fault planes remain distinct structures at depth, indicative of conjugate faulting, and do not appear to coalesce onto a throughgoing fault segment. We observe a complex spatiotemporal migration of aftershocks, with seismicity that jumps between individual fault segments that are active for only a few days to weeks. Aftershock rates are roughly consistent with the expected earthquake production rates of Dieterich (1994). The conjugate pattern of faulting and nonuniform aftershock migration patterns suggest that strain in the Yuha Desert is being accommodated in a complex manner.

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The New IASPEI Manual of Seismological Observatory Practice

Cited by 120 publications

References 2 publications

New aspect of transition between line and continuous spectrum and its relation to seismic influence on structures

New aspect of transition between line and continuous spectrum and its relation to seismic influence on structures

Analysis of tide gauge records from the December 2004 Indian Ocean tsunami

Aftershocks of the 2010 M_w 7.2 El Mayor‐Cucapah earthquake reveal complex faulting in the Yuha Desert, California

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The New IASPEI Manual of Seismological Observatory Practice

Cited by 120 publications

References 2 publications

New aspect of transition between line and continuous spectrum and its relation to seismic influence on structures

New aspect of transition between line and continuous spectrum and its relation to seismic influence on structures

Analysis of tide gauge records from the December 2004 Indian Ocean tsunami

Aftershocks of the 2010 Mw 7.2 El Mayor‐Cucapah earthquake reveal complex faulting in the Yuha Desert, California

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Product

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Aftershocks of the 2010 M_w 7.2 El Mayor‐Cucapah earthquake reveal complex faulting in the Yuha Desert, California