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Journal Article
Published: 06 November 2019
Seismological Research Letters (2019)
...Adam T. Ringler; David C. Wilson; Emily Wolin; Tyler Storm; Leo Sandoval ABSTRACT World‐Wide Standardized Seismograph Network (WWSSN) records contain daily calibration pulses that can be used to retrieve the magnification as well as the response of the instrument for a given day record. We analyze...
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Journal Article
Published: 05 December 2018
Seismological Research Letters (2019) 90 (1): 401-408.
...A. C. B. Alejandro; C. R. Hutt; A. T. Ringler; S. V. Moore; R. E. Anthony; D. C. Wilson ABSTRACT From 1961 to 1996, the Albuquerque Seismological Laboratory (ASL) installed and operated the World‐Wide Standardized Seismograph Network (WWSSN). Each station within the network consisted of three...
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Journal Article
Published: 01 August 1982
Bulletin of the Seismological Society of America (1982) 72 (4): 1207-1218.
... of WWSSN stations. The crustal structure beneath these stations has been studied by examining their crustal transfer characteristics for incident teleseismic P waves. At those stations well removed from the collision boundary ( POO , KOD , NDI , SHI , and MSH ), the crustal structure appears...
Journal Article
Published: 01 April 1979
Bulletin of the Seismological Society of America (1979) 69 (2): 329-351.
...Barbara Radovich Williams abstract A single calibration curve which relates seismic moment ( M o to the AR parameter, a time domain sum of the area under the surface-wave envelope, has been found applicable to 20 WWSSN long-period instruments recording surface waves over predominantly oceanic paths...
Journal Article
Published: 01 October 2005
Bulletin of the Seismological Society of America (2005) 95 (5): 1809-1824.
..., thereby eliminating any discrepancies that result from using different networks of stations. We compare the reproduced pde and reb magnitudes to another magnitude measurement, m b ( P ), that is based on the Worldwide Standard Seismographic Network ( wwssn ) short-period instrument. We find...
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Image
Digitized calibration pulse (orange) for <b>WWSSN</b> long‐period vertical (LPZ) d...
Published: 06 November 2019
Figure 2. Digitized calibration pulse (orange) for WWSSN long‐period vertical (LPZ) data from station ALQ on 1 January 1974, starting at 18:15. The blue curve is a synthetic best‐fit calibration curve.
Image
(a) Best‐fit parameters for <b>WWSSN</b> station ALQ LPZ for the resonant angular ...
Published: 06 November 2019
Figure 3. (a) Best‐fit parameters for WWSSN station ALQ LPZ for the resonant angular frequency of the seismometer ( ω s ) in radians per second for each of the calibration pulses used (blue circles). We have plotted a nominal parameter line in orange. (b–e) are the same
Image
(a) Digitized seismic background noise (blue) from <b>WWSSN</b> station ALQ for LP...
Published: 06 November 2019
Figure 4. (a) Digitized seismic background noise (blue) from WWSSN station ALQ for LPZ component for 1 August 1964, starting at 17:17. The interpolated and uniform sampled data are overlain (orange). The magnification was estimated at × 2339 . (b) The same as (a) but band‐pass filtered from
Image
Power spectral density (PSD) estimates (blue) from <b>WWSSN</b> station ALQ for LP...
Published: 06 November 2019
Figure 5. Power spectral density (PSD) estimates (blue) from WWSSN station ALQ for LPZ. The pointwise minimum is also included (orange). For reference, we show the WWSSN long‐period (LP, green) and short‐period (SP, red) noise models ( Peterson and Hutt, 1989 ) as well as the New High‐Noise Model
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Mean values of daily PSD estimates for Digital <b>WWSSN</b> station ALQ for the th...
Published: 06 November 2019
Figure 7. Mean values of daily PSD estimates for Digital WWSSN station ALQ for the three long‐period components, with LHZ in blue, LHN in yellow, and LHE in green, from 1981 to 1982. We also include the 92nd percentile of the SP vertical component (red). The gray area indicates where the long
Image
Map of the World‐Wide Standardized Seismograph Network (<b>WWSSN</b>) stations (tr...
Published: 05 December 2018
Figure 1. Map of the World‐Wide Standardized Seismograph Network (WWSSN) stations (triangles) where the quantity of film chips scanned is depicted by a log color scale.
Image
Station film chip scans by day for all <b>WWSSN</b> stations and the Canadian netw...
Published: 05 December 2018
Figure 5. Station film chip scans by day for all WWSSN stations and the Canadian network stations for the long‐period vertical component (channel: LPZ). Each tick mark represents a single film chip that has been scanned.
Image
The displacement sensitivity of the <b>WWSSN</b> short‐period ( SP ) instrument. T...
Published: 01 May 2014
Figure 1. The displacement sensitivity of the WWSSN short‐period ( SP ) instrument. The given pole‐zero specification has a displacement sensitivity of 1.0 at 1.0 Hz.
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Comparison of the displacement sensitivity of the <b>WWSSN</b>  SP  system to disp...
Published: 01 May 2014
Figure 6. Comparison of the displacement sensitivity of the WWSSN SP system to displacement spectra at a distance of 1.0 km for the Atkinson and Boore (1995 ; dashed curve) and Frankel et al. (1996 ; solid curve) models as a function of moment magnitude.
Image
Simulated  <b>WWSSN</b>  SP  vertical-component seismograms for the North Korean n...
Published: 01 December 2008
Figure 5. Simulated WWSSN SP vertical-component seismograms for the North Korean nuclear explosion. The maximum amplitudes and the group velocities are illustrated in the figure.
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Annual count of the number of stations in the <b>WWSSN</b> and the GSN since the f...
Published: 01 March 2008
Figure 2. Annual count of the number of stations in the WWSSN and the GSN since the first station installations in each network. Graphic courtesy of Rhett Butler, IRIS.
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Normalized displacement responses of a typical  <b>wwssn</b>  short-period instrum...
Published: 01 February 2007
Figure 1. Normalized displacement responses of a typical wwssn short-period instrument, the bandpass filtering applied by the usgs for its automatic pde processing procedure, and the filtering according to the pidc procedure for short-period data analysis. All responses
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Displacement responses of a typical  <b>wwssn</b>  short-period instrument, a broa...
Published: 01 October 2005
Figure 4. Displacement responses of a typical wwssn short-period instrument, a broadband station processed according to the usgs procedure (bandpass filtering from 0.5 to 6.5 Hz and 1.05 to 2.65 Hz), and a broadband station processed according to the pidc procedure (zero-phase bandpass
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(A) <b>WWSSN</b> inset for ALQ SPZ seismogram for the 1964 Alaska  M w   9.2 earth...
Published: 01 May 2005
Figure 3. (A) WWSSN inset for ALQ SPZ seismogram for the 1964 Alaska M w 9.2 earthquake (∼38° from the earthquake). Each time trace represents 15 minutes, so there are four traces to the hour. Note onset time of first arrival. (B) Full-scale recording of GSN station for Sumatra-Andaman
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Comparison between observed <b>WWSSN</b> short-period vertical record at CHK and c...
Published: 01 October 2003
Figure 5. Comparison between observed WWSSN short-period vertical record at CHK and corresponding synthetics for various focal depths. The pP arrival time is best fit with synthetics for 19 km depth (marked by a solid inverted triangle), whereas the sP arrival can be best matched