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Journal Article

Depth Discrimination Using Rg ‐to‐ Sg Spectral Amplitude Ratios for Seismic Events in Utah Recorded at Local Distances Available to Purchase

Rigobert Tibi, Keith D. Koper, Kristine L. Pankow, Christopher J. Young
Published: 20 March 2018
Bulletin of the Seismological Society of America (2018) 108 (3A): 1355–1368.
DOI: https://doi.org/10.1785/0120170257
.... In the Utah region, strong Rg waves traveling with an average group velocity of about 1.8 km / s are observed at ∼ 1 Hz on waveforms from shallow events ( depth < 10 km ) recorded at distances up to about 150 km. At these distances, Sg waves, which are direct shear waves traveling in the upper crust...
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View PDF for article title, Depth Discrimination Using Rg ‐to‐ <span class="search-highlight">Sg</span> Spectral Amplitude Ratios for Seismic Events in Utah Recorded at Local Distances
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SG wave solutions. I — solitons, II — excitons. υ0 is characteristic rate of process, after (Davydov, 1982).

SG wave solutions. I — solitons, II — excitons. υ0 is characteristic rate o... Available to Purchase

Published: 01 June 2008
Fig. 3. SG wave solutions. I — solitons, II — excitons. υ0 is characteristic rate of process, after ( Davydov, 1982 ).
Journal Article

Magnitude Scales for Marsquakes Calibrated from InSight Data Available to Purchase

Maren Böse, Simon C. Stähler, Nicholas Deichmann, Domenico Giardini, John Clinton, Philppe Lognonné, Savas Ceylan, Martin van Driel, Constantinos Charalambous, Nikolaj Dahmen, Anna Horleston, Taichi Kawamura, Amir Khan, Martin Knapmeyer, Guénolé Orhand‐Mainsant, John‐Robert Scholz, Fabian Euchner, W. Bruce Banerdt
Published: 22 June 2021
Bulletin of the Seismological Society of America (2021) 111 (6): 3003–3015.
DOI: https://doi.org/10.1785/0120210045
... and secondary phase arrivals are extremely challenging to identify; (3) the majority of identified events include a strong excitation of an unexpected 2.4 Hz ground resonance; and (4) so‐called high‐frequency (HF) events exist that are visible mainly as guided Pg / Sg wave trains. In view of these observations...
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View PDF for article title, Magnitude Scales for Marsquakes Calibrated from InSight Data
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Journal Article

Structure of the Upper Crust in Japan from S -Wave Attenuation Tomography Available to Purchase

Shunping Pei, Zhongxiong Cui, Youshun Sun, M. Nafi Toksöz, Charlotte A. Rowe, Xing Gao, Junmeng Zhao, Hongbing Liu, Jiankun He, F. Dale Morgan
Published: 01 February 2009
Bulletin of the Seismological Society of America (2009) 99 (1): 428–434.
DOI: https://doi.org/10.1785/0120080029
... the attenuation tomography method of Pei et al. (2006) using M L amplitude data to estimate attenuation within the upper crust in Japan. More than 60,000 Sg -wave maximum amplitude readings from 5559 events, recorded by 971 stations, were selected from the dense High-Sensitivity Seismography Network (Hi-net...
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View PDF for article title, Structure of the Upper Crust in Japan from S -<span class="search-highlight">Wave</span> Attenuation Tomography
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The three-component displacement and velocity records in station hec. The data are low-pass filtered to 1 Hz. The time-mark T1 indicates the arrival time of P wave. Labels T2 and T3 are the predicted and observed Sg wave arrival times, respectively.

The three-component displacement and velocity records in station hec . The... Available to Purchase

Published: 01 May 2002
Figure A2. The three-component displacement and velocity records in station hec . The data are low-pass filtered to 1 Hz. The time-mark T1 indicates the arrival time of P wave. Labels T2 and T3 are the predicted and observed Sg wave arrival times, respectively.
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The mainshock and two small aftershocks registered on the 10,708 permanent reservoir monitoring system (PRM) sensors deployed at the Snorre field. Here we display the vertical component together with the two horizontal components for all three events. The traces are normalized and sorted by distance to the location of the mainshock. In the first column, we observe the Pg wave together with a secondary arrival, which represents a water multiple (Pw). The Sg wave is clearly observed on the horizontal components for the mainshock and aftershock 1. In addition, to the right in the figure we show examples of P and S wave picks. The picking uncertainty, in this case, is less than ∼0.05 s for the P wave and slightly higher than ∼0.1 s for the S wave. The color version of this figure is available only in the electronic edition.

The mainshock and two small aftershocks registered on the 10,708 permanent ... Available to Purchase

Published: 17 November 2023
and sorted by distance to the location of the mainshock. In the first column, we observe the Pg wave together with a secondary arrival, which represents a water multiple ( Pw ). The Sg wave is clearly observed on the horizontal components for the mainshock and aftershock 1. In addition, to the right
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Line EF results. (a) Composite complexity section. (b) Variation of Poisson’s Ratio computed from the traveltime ratios of Pg and Sg waves for shot station distances less than 50 km. (c) Velocity anomaly section. This was computed by subtracting the reference model from the velocity tomographic solution of Winardhi and Mereu (1997). Abitibi and Quetico refer to subprovinces.

Line EF results. ( a ) Composite complexity section. ( b ) Variation of Poi... Available to Purchase

Published: 02 April 2000
Fig. 13. Line EF results. ( a ) Composite complexity section. ( b ) Variation of Poisson’s Ratio computed from the traveltime ratios of Pg and Sg waves for shot station distances less than 50 km. ( c ) Velocity anomaly section. This was computed by subtracting the reference model from
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Line XY results. (a) Composite complexity section. (b) Variation of Poisson’s Ratio computed from the traveltime ratios of Pg and Sg waves for shot station distances less than 50 km. (c) Velocity anomaly section. This was computed by subtracting the reference model from the velocity tomographic solution of Winardhi and Mereu (1997). SIC, Sudbury Igneous Complex; Southern, Southern Provinces.

Line XY results. ( a ) Composite complexity section . (b ) Variation of Poi... Available to Purchase

Published: 02 April 2000
Fig. 12. Line XY results. ( a ) Composite complexity section . (b ) Variation of Poisson’s Ratio computed from the traveltime ratios of Pg and Sg waves for shot station distances less than 50 km. ( c ) Velocity anomaly section. This was computed by subtracting the reference model from
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Comparisons between template seismograms (short traces) and the seismic signals detected in the continuous waveform data (long traces) based on the single‐station sliding cross‐correlation method. Templates, mean CCs, and seismic phases are marked under the corresponding origin times and magnitudes of the detected seismic events. (a) Pg waves observed at station YNB and Sg waves at stations (b) YNB, (c) CBT, and (d) CBS for 12 well‐constrained events indicated by inverted solid triangles in Figure 4a are used as templates. The color version of this figure is available only in the electronic edition.

Comparisons between template seismograms (short traces) and the seismic sig... Available to Purchase

Published: 12 September 2018
and magnitudes of the detected seismic events. (a)  Pg waves observed at station YNB and Sg waves at stations (b) YNB, (c) CBT, and (d) CBS for 12 well‐constrained events indicated by inverted solid triangles in Figure  4a are used as templates. The color version of this figure is available only
Image
Line MDG results. (a) Composite complexity section. (b) Variation of Poisson’s Ratio computed from the traveltime ratios of Pg and Sg waves for shot station distances less than 50 km. Abbreviations as in Fig. 3. Line MDG results. (c) Velocity anomaly section. This was computed by subtracting the reference model from the velocity tomographic solution of Winardhi and Mereu (1997). Abbreviations as in Fig. 3.

Line MDG results. ( a ) Composite complexity section. ( b ) Variation of Po... Available to Purchase

Published: 02 April 2000
Fig. 14. Line MDG results. ( a ) Composite complexity section. ( b ) Variation of Poisson’s Ratio computed from the traveltime ratios of Pg and Sg waves for shot station distances less than 50 km. Abbreviations as in Fig.  3 . Line MDG results. ( c ) Velocity anomaly section. This was computed
Image
Line MDG results. (a) Composite complexity section. (b) Variation of Poisson’s Ratio computed from the traveltime ratios of Pg and Sg waves for shot station distances less than 50 km. Abbreviations as in Fig. 3. Line MDG results. (c) Velocity anomaly section. This was computed by subtracting the reference model from the velocity tomographic solution of Winardhi and Mereu (1997). Abbreviations as in Fig. 3.

Line MDG results. ( a ) Composite complexity section. ( b ) Variation of Po... Available to Purchase

Published: 02 April 2000
Fig. 14. Line MDG results. ( a ) Composite complexity section. ( b ) Variation of Poisson’s Ratio computed from the traveltime ratios of Pg and Sg waves for shot station distances less than 50 km. Abbreviations as in Fig.  3 . Line MDG results. ( c ) Velocity anomaly section. This was computed
Journal Article

Q estimates along the wasatch front in Utah derived from Sg and Lg wave amplitudes Available to Purchase

S. R. Brockman, G. A. Bollinger
Published: 01 February 1992
Bulletin of the Seismological Society of America (1992) 82 (1): 135–147.
DOI: https://doi.org/10.1785/BSSA0820010135
...; epicentral distance range 10 to 450 km) located along the Utah-Idaho border and propagating Sg and Lg waves southward to seismograph stations along the Wasatch front in north central Utah. The regression model includes parameters to account for geometric spreading, anelastic attenuation with a power-law...
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Line AB results. (a) Composite complexity section. (b) Variation of Poisson’s Ratio computed from the traveltime ratios of Pg and Sg waves for shot station distances less than 50 km. (c) Velocity anomaly section. This was computed by subtracting the reference model from the velocity tomographic solution of Winardhi and Mereu (1997). BRIT, Britt terrane; GFTZ, Grenville Front Tectonic Zone; SIC, Sudbury Igneous Complex; Superior, Superior Province. Other abbreviations as in Fig. 1.

Line AB results. ( a ) Composite complexity section. ( b ) Variation of Poi... Available to Purchase

Published: 02 April 2000
Fig. 11. Line AB results. ( a ) Composite complexity section. ( b ) Variation of Poisson’s Ratio computed from the traveltime ratios of Pg and Sg waves for shot station distances less than 50 km. ( c ) Velocity anomaly section. This was computed by subtracting the reference model from
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Prediction of site‐specific waveforms and response spectra for the 2022 Mulhouse ML 4.7 earthquake. The waveform recorded by the SZUZ station (epicenter distance of 86 km) is deconvolved into the motion on the Swiss reference profile, which is subsequently convolved with site‐specific predictive TFs along the cross‐section A–A′ in Zürich city. Predicted acceleration waveforms in panel (a) have a common scale (zoomed in on the Sg‐wave phase), and their Fourier spectra are shown in panel (b). Acceleration response spectra in panel (c) are computed by the Newmark time‐integration method from the site‐specific waveforms. This figure is supplemented by prediction using single‐path TFs in Figure S7.

Prediction of site‐specific waveforms and response spectra for the 2022 Mul... Available to Purchase

Published: 03 November 2023
‐specific predictive TFs along the cross‐section A–A′ in Zürich city. Predicted acceleration waveforms in panel (a) have a common scale (zoomed in on the Sg ‐wave phase), and their Fourier spectra are shown in panel (b). Acceleration response spectra in panel (c) are computed by the Newmark time
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Mean CCs of potential seismic events from 1 May 2017 to 25 April 2018. (a) Mean CCs of potential seismic events (triangles) based on the M&amp;L method and the four templates (the collapse and the three reported earthquakes; Tian et al., 2018). A mean CC of 0.35 (horizontal dashed line) is regarded as detection threshold for a seismic event, with greater CCs solid triangles and smaller CCs open triangles. Four templates (with mean CCs=1.0) and 8 detected events with well‐constrained locations (Table 1) are shown as inverted solid triangles (also shown in Fig. 6), and another 10 detected ones are non‐inverted solid triangles (Ⓔ Table S1, available in the electronic supplement to this article). (b) Mean CCs of potential seismic events (triangles) based on the single‐station sliding cross‐correlation method. Pg waves observed at station YNB and Sg waves at stations YNB, CBT, and CBS for all the well‐constrained events indicated by inverted solid triangles in (a) are regarded as templates. A mean CC of 0.7 (horizontal dashed line) is regarded as detection threshold for a seismic event. The event information of 66 detected events (inverted solid triangles) is presented in Ⓔ Table S2. The occurrence of the 2017 test is indicated by a vertical dashed line. Shaded areas indicate the time window of data gap. The color version of this figure is available only in the electronic edition.

Mean CCs of potential seismic events from 1 May 2017 to 25 April 2018. (a) ... Available to Purchase

Published: 12 September 2018
), and another 10 detected ones are non‐inverted solid triangles (Ⓔ Table S1, available in the electronic supplement to this article). (b) Mean CCs of potential seismic events (triangles) based on the single‐station sliding cross‐correlation method. Pg waves observed at station YNB and Sg waves at stations
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(a) Foreshocks recorded at GUYB station. They are aligned by their P‐wave arrival and exhibit similar features as well as similar Sg–Pg times. All traces are normalized. (b) Examples of aftershocks recorded at station GUYB. They are aligned by their P‐wave arrivals. Most of them show similar features as well as similar Sg–Pg times. Few events have large Sg–Pg times. All traces are normalized to one. E, east–west component; N, north–south component; Z, vertical component.

(a) Foreshocks recorded at GUYB station. They are aligned by their P ‐wave... Available to Purchase

Published: 12 November 2019
Figure 2. (a) Foreshocks recorded at GUYB station. They are aligned by their P ‐wave arrival and exhibit similar features as well as similar Sg – Pg times. All traces are normalized. (b) Examples of aftershocks recorded at station GUYB. They are aligned by their P ‐wave arrivals. Most of them
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Pulse-transmission and SG measurements of 47 drill-core samples taken from BH1. Crossplots of VP and VS versus SG are displayed. SG has been color coded by different SG ranges. Bottom left; VP versus VS has been plotted and has an average value of 1.70. The bottom right is a comparison of FWS P-wave and SG core measurements.

Pulse-transmission and SG measurements of 47 drill-core samples taken from ... Available to Purchase

Published: 06 September 2012
and has an average value of 1.70. The bottom right is a comparison of FWS P-wave and SG core measurements.
Journal Article

Extracting Long‐Period Surface Waves and Free Oscillations Using Ambient Noise Recorded by Global Distributed Superconducting Gravimeters Available to Purchase

Hang Li, Jianqiao Xu, Xiaodong Chen, Heping Sun, Miaomiao Zhang, Lingyun Zhang
Published: 27 May 2020
Seismological Research Letters (2020) 91 (4): 2234–2246.
DOI: https://doi.org/10.1785/0220190166
... the gravity tidal observations of seven global distributed superconducting gravimeters (SGs) and the seismic observations for validation from three collocated STS‐1 seismometers, long‐period surface waves and background free oscillations are successfully extracted by the phase autocorrelation (PAC) method...
View PDF for article title, Extracting Long‐Period Surface <span class="search-highlight">Waves</span> and Free Oscillations Using Ambient Noise Recorded by Global Distributed Superconducting Gravimeters
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Journal Article

Explosion Shear‐Wave Generation in High‐Velocity Source Media Available to Purchase

G. Eli Baker, Jeffry L. Stevens, Heming Xu
Published: 01 August 2012
Bulletin of the Seismological Society of America (2012) 102 (4): 1301–1319.
DOI: https://doi.org/10.1785/0120110119
... * and Rg ‐to‐ Lg scattering are not. We also analyze and model a large set of Degelen explosion records from approximately 10 to 90 km. The local Sg spectral corner frequency is lower than the Pg corner frequency by approximately the source P ‐to‐ S velocity ratio, which is consistent with shear waves...
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Snapshots of wave fields at time 1.2 s on the coarse grid of Δx=Δz=50  m, generated by (a) the two‐step STEM, (b) the eighth‐order LWC, (c) the eighth‐order SG, and (d) the fourth‐order SG for the 2D homogeneous case.

Snapshots of wave fields at time 1.2 s on the coarse grid of Δ x =Δ z =50  ... Available to Purchase

Published: 01 April 2013
Figure 5. Snapshots of wave fields at time 1.2 s on the coarse grid of Δ x =Δ z =50  m, generated by (a) the two‐step STEM , (b) the eighth‐order LWC , (c) the eighth‐order SG, and (d) the fourth‐order SG for the 2D homogeneous case.