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Seismograph

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Journal Article
Published: 18 October 2024
Bulletin of the Seismological Society of America (2025) 115 (1): 210–227.
...Wenze Deng; Guangjie Han; Juan Li; Li Sun ABSTRACT The China Digital Seismograph Network, one of the largest national seismic networks, has been operating for over four decades which provides valuable seismic data for various scientific studies. Our investigation gathered a comprehensive dataset...
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Journal Article
Published: 09 May 2022
Seismological Research Letters (2022) 93 (5): 2451–2466.
...Timothy P. Nagle‐McNaughton; Adam T. Ringler; Robert E. Anthony; Alexis C. B. Alejandro; David C. Wilson; Justin T. Wilgus Abstract The U.S. Geological Survey (USGS) maintains an archive of 189,180 digitized scans of analog seismic records from the World‐Wide Standardized Seismograph Network (WWSSN...
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Journal Article
Published: 01 July 2021
Earthquake Spectra (2021) 37 (1_suppl): 1487–1515.
... sites and become challenging in terms of field logistics and interpretation in more complex geologic settings including rock sites. Multiple noninvasive active- and passive-seismic techniques are applied at 25 seismograph stations across Eastern Canada. It is typically assumed that these stations...
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Journal Article
Published: 30 September 2020
Seismological Research Letters (2020) 91 (6): 3622–3633.
... variations in seismicity, and other important aspects of the earthquake sequence, we recorded aftershocks and ambient noise using up to 461 three‐component nodal seismographs for about two months, beginning about one day after the M w 7.1 mainshock. The ∼ 30 , 000 M w ≥ 1 earthquakes that were recorded...
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Journal Article
Published: 20 November 2019
Seismological Research Letters (2020) 91 (1): 126–141.
... to calibrate the lacustrine seismograph. Figure 2. (a) Nephelometric Turbidity Units of the Eklutna Lake water at the Eklutna water facility several days before and after the 2018 earthquake. (b) The same data for the first hours after the earthquake with the time window in which the “dirt streak...
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Journal Article
Published: 23 October 2019
Seismological Research Letters (2020) 91 (2A): 585–592.
...Allison L. Bent; Timothy J. Côté; Henry C. J. Seywerd; David A. McCormack; Kathryn A. Coyle Abstract The Canadian National Seismograph Network (CNSN) operated by Natural Resources Canada consists of approximately 200 stations. Data from this network are used to produce the national earthquake...
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Journal Article
Published: 10 April 2019
Seismological Research Letters (2019) 90 (3): 1191–1199.
...Tran Danh Hung; Ting Yang; Ba Manh Le; Youqiang Yu ABSTRACT A free‐fall ocean‐bottom seismograph (OBS) cannot always achieve the desired seismometer leveling because of the impact of the descending OBS with the seafloor and the complexities of the ocean bottom. How a failure of the leveling system...
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Journal Article
Published: 03 April 2019
Seismological Research Letters (2019) 90 (3): 1200–1208.
...Paris T. Smalls; Robert A. Sohn; John A. Collins ABSTRACT Ambient‐noise records from a seismograph deployed in Yellowstone Lake during July–August 2016 contain high‐amplitude signals in the 0.4–1.1 Hz frequency band, which exhibit strong diurnal variations. These diurnal amplitude variations...
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Journal Article
Published: 01 March 2019
South African Journal of Geology (2019) 122 (1): 57–68.
...M.B.C. Brandt Abstract The spatially varying magnitude completeness, Mc , of the earthquake catalogue recorded by the South African National Seismograph Network (SANSN) from October 2012 to February 2017 is presented. Two methods were utilised to estimate locally observed magnitude completeness...
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Journal Article
Published: 02 March 2016
Seismological Research Letters (2016) 87 (3): 648–660.
... the catalog into three time periods (1985–2002, 2003–2013, and 2013–2015; marked by different symbols in Fig.  2 ). The observed trend of seismicity toward the present is probably due to the combined effect of the addition of new seismograph stations in western Canada and the increase in shale gas development...
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Journal Article
Published: 01 March 2016
South African Journal of Geology (2016) 119 (1): 291–304.
...I. Saunders; A. Kijko; C.J.S. Fourie Abstract We analyzed the changes/improvements of seismic event detection and location accuracy of the South African National Seismograph Network over the last four decades. The effect of three regional velocity models on epicentral solutions was tested during...
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Journal Article
Published: 01 January 2016
Seismological Research Letters (2016) 87 (1): 186–192.
...‐NAVI, these students accepted the challenge of building (under the supervision of their physics teacher) their own low‐cost seismograph using the Arduino hardware (see Data and Resources ), an open‐source electronics platform based on easy‐to‐use hardware. Arduino is used by small developers to create...
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Journal Article
Published: 19 August 2015
Seismological Research Letters (2015) 86 (5): 1238–1246.
... ), which comprised 60 three‐component broadband ocean‐bottom seismographs ( OBS s), the deployment and operation of land‐based seismographs as part of the USArray Transportable Array, and the upgrade of Plate Boundary Observatory Global Positioning System ( GPS ) stations to high‐rate real‐time data...
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Journal Article
Published: 29 July 2015
Seismological Research Letters (2015) 86 (5): 1364–1373.
... data are essential to earthquake studies, one of the first elements of this protocol was the establishment of the China Digital Seismograph Network ( CDSN ; Fig.  1 and Table S1, available in the electronic supplement to this article.). Figure 1. Map of China and surrounding area showing...
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Journal Article
Published: 18 March 2015
Seismological Research Letters (2015) 86 (3): 908–916.
... the period October 2000 to December 2005, 5806 regional earthquake epicenters were determined during routine analysis with the SEISAN software ( Ottemöller et al. , 2012 ) as recorded by the South African National Seismograph Network (SANSN). A total of 1380 of these epicenters were determined through...
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... We characterize shear-wave velocity versus depth (Vs profile) at 16 portable seismograph sites through the epicentral region of the 2011 M w 5.8 Mineral (Virginia, USA) earthquake to investigate ground-motion site effects in the area. We used a multimethod acquisition and analysis approach...
Journal Article
Published: 03 December 2014
Seismological Research Letters (2015) 86 (1): 101–108.
... System ( GNSS ) and seismic monitoring stations along the Hikurangi margin. (a)  GNSS monitoring stations are denoted by white triangles (HiMNet) and gray triangles (PositioNZ Network). (b) Seismic monitoring stations are shown by white circles (HiMNet) and gray circles (National Seismograph Network...
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Journal Article
Published: 18 November 2014
Bulletin of the Seismological Society of America (2015) 105 (1): 489–495.
... earthquake monitoring off Vancouver Island in northern Cascadia using ocean‐bottom seismographs. Our results show that most of the offshore seismicity is concentrated along the Nootka fault zone. Otherwise seismicity is extremely low, with no earthquakes located along the shallow, seismogenic part...
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Journal Article
Published: 01 March 2014
Seismological Research Letters (2014) 85 (2): 361–364.
...Willy Aspinall; Roger Musson Selfridge’s seismograph apparently recorded at least 66 global earthquakes in the period from June 1932 through 1934, according to the epicenter markers on a chart displayed in the store (Fig.  3 ). These records included an M w  5.3 Belgium earthquake of 11...
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Journal Article
Published: 01 December 2011
South African Journal of Geology (2011) 114 (3-4): 561–572.
... will host a permanent LaCoste and Romberg ultra-sensitive gravimeter as well as a long period seismograph. The site is close to the contact between the Dwyka Formation of the Karoo Supergroup and the Witteberg Group, both part of the Cape Supergroup. A site survey, joint analysis, core logging...
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