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Journal Article

The 9 October 1963 Vajont Catastrophe from the Point of View of the WWSSN‐LP Recordings of the TRI‐117 Station, Trieste, Italy

Stefano Parolai, Denis Sandron, Alessandro Rebez
Published: 05 May 2021
Seismological Research Letters (2021) 92 (6): 3428–3436.
DOI: https://doi.org/10.1785/0220200467
... Institute of Oceanography and Applied Geophysics (OGS) (Fig.  1b ) and installed in Borgo Grotta Gigante (about 12 km from Trieste) just a few months before (29 July 1963) the Vajont event and belonging to the Worldwide Standardized Seismographic Station Network (WWSSN; Sandron et al. , 2015 ). Because...
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Journal Article

Calibration Analysis and Noise Estimates of WWSSN Station ALQ (Albuquerque, New Mexico)

Adam T. Ringler, David C. Wilson, Emily Wolin, Tyler Storm, Leo Sandoval
Published: 06 November 2019
Seismological Research Letters (2020) 91 (3): 1359–1366.
DOI: https://doi.org/10.1785/0220190201
...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

The Albuquerque Seismological Lab WWSSN Film Chip Preservation Project

A. C. B. Alejandro, C. R. Hutt, A. T. Ringler, S. V. Moore, R. E. Anthony, D. C. Wilson
Published: 05 December 2018
Seismological Research Letters (2019) 90 (1): 401–408.
DOI: https://doi.org/10.1785/0220180275
...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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Includes: Supplemental Content
Journal Article

Station site characteristics of WWSSN stations in India and southern Asia

Lynn L. Peseckis, L. J. Burdick
Published: 01 August 1982
Bulletin of the Seismological Society of America (1982) 72 (4): 1207–1218.
DOI: https://doi.org/10.1785/BSSA0720041207
... 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...
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Journal Article

M o calculations from a generalized AR parameter method for WWSSN instruments

Barbara Radovich Williams
Published: 01 April 1979
Bulletin of the Seismological Society of America (1979) 69 (2): 329–351.
DOI: https://doi.org/10.1785/BSSA0690020329
...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...
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Relative gain used for correction. For the <span class="search-highlight">WWSSN</span>‐SP response the maximum ga...

Relative gain used for correction. For the WWSSN‐SP response the maximum ga...

Published: 12 April 2024
Figure 1. Relative gain used for correction. For the WWSSN‐SP response the maximum gain is divided by gain at period T .
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Northeast Greenland DAG <span class="search-highlight">WWSSN</span> SP Z with STS‐2 Z component (filtered 1–5 Hz)...

Northeast Greenland DAG WWSSN SP Z with STS‐2 Z component (filtered 1–5 Hz)...

Published: 12 January 2022
Figure 7. Northeast Greenland DAG WWSSN SP Z with STS‐2 Z component (filtered 1–5 Hz) overlain (in red) and scaled to see the extent of clipping on the WWSSN SP Z record. The color version of this figure is available only in the electronic edition.
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TRI‐117 <span class="search-highlight">WWSSN</span> long‐period recordings of the Vajont event: (a) Z (vertical) ...

TRI‐117 WWSSN long‐period recordings of the Vajont event: (a) Z (vertical) ...

Published: 05 May 2021
Figure 3. TRI‐117 WWSSN long‐period recordings of the Vajont event: (a) Z (vertical) component (top), (b) north–south component (middle), and (c) east–west component (bottom). The thick line indicates the part of the seismogram that has been digitized (for each component, this for 12 min
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Displacement responses of a typical <span class="search-highlight">WWSSN</span> short-period instrument and a typ...

Displacement responses of a typical WWSSN short-period instrument and a typ...

Published: 01 November 2002
Figure 1. Displacement responses of a typical WWSSN short-period instrument and a typical broadband station after processing the data according to PIDC procedure (0.8–4.5 Hz bandpass). Note that the PIDC displacement response is asymmetrical and that its peak occurs at a much higher frequency
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Records from four Worldwide Standard Seismograph Network (<span class="search-highlight">WWSSN</span>) stations f...

Records from four Worldwide Standard Seismograph Network (WWSSN) stations f...

Published: 15 January 2020
Figure 8. Records from four Worldwide Standard Seismograph Network (WWSSN) stations for 10 January 1962 showing a two‐minute span. The long dash at the top is the 1100 hr mark; the three‐short dashes below it are minute marks for 1115, 1130, 1145; there is no mark on the next line (1200
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Digitized calibration pulse (orange) for <span class="search-highlight">WWSSN</span> long‐period vertical (LPZ) d...

Digitized calibration pulse (orange) for WWSSN 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.
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(a) Best‐fit parameters for <span class="search-highlight">WWSSN</span> station ALQ LPZ for the resonant angular ...

(a) Best‐fit parameters for WWSSN 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
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(a) Digitized seismic background noise (blue) from <span class="search-highlight">WWSSN</span> station ALQ for LP...

(a) Digitized seismic background noise (blue) from WWSSN 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
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Power spectral density (PSD) estimates (blue) from <span class="search-highlight">WWSSN</span> station ALQ for LP...

Power spectral density (PSD) estimates (blue) from WWSSN 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 <span class="search-highlight">WWSSN</span> station ALQ for the th...

Mean values of daily PSD estimates for Digital WWSSN 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
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Map of the World‐Wide Standardized Seismograph Network (<span class="search-highlight">WWSSN</span>) stations (tr...

Map of the World‐Wide Standardized Seismograph Network (WWSSN) 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.
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Station film chip scans by day for all <span class="search-highlight">WWSSN</span> stations and the Canadian netw...

Station film chip scans by day for all WWSSN 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.
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(a) Vajont dam is located 134 km northwest of the TRI‐117 Worldwide Standar...

(a) Vajont dam is located 134 km northwest of the TRI‐117 Worldwide Standar...

Published: 05 May 2021
Figure 1. (a) Vajont dam is located 134 km northwest of the TRI‐117 Worldwide Standardized Seismographic Station Network (WWSSN) installed at the National Institute of Oceanography and Applied Geophysics (OGS) near Trieste (northeast Italy). In the top right inset map the position of the study
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The displacement sensitivity of the <span class="search-highlight">WWSSN</span> short‐period ( SP ) instrument. T...

The displacement sensitivity of the WWSSN 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 <span class="search-highlight">WWSSN</span> SP system to disp...

Comparison of the displacement sensitivity of the WWSSN 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.