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portable active seismic source methods

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Journal Article
Published: 08 March 2023
Seismological Research Letters (2023) 94 (3): 1392–1404.
... structure of the source region is missing. Here, we applied an improved ambient noise tomography method to seismic data recorded by a portable dense seismic array to reveal the characteristic of 3D shear‐wave velocity ( V S ) structure with high resolution in the Changning region. Our V S structure model...
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Journal Article
Published: 14 July 2020
Bulletin of the Seismological Society of America (2020) 110 (4): 1517–1529.
... in the past 20 yr, providing an opportunity to collect near‐source recordings of the aftershock sequence ( Cochran et al. , 2020 ) (Figs.  1 and 2 ). Figure 1. Map of seismic stations and M w ≥ 4 earthquakes in the July 2019 Ridgecrest earthquake sequence used in this study, with portable...
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Journal Article
Journal: The Leading Edge
Published: 01 June 2015
The Leading Edge (2015) 34 (6): 628–639.
... the source of the activity and its potential hazard to local communities and energy-industry infrastructure. Efforts to monitor and characterize the earthquake sequences in central Oklahoma are reviewed. Since early 2010, numerous organizations have deployed temporary portable seismic stations in central...
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..., where active-source horizontal shear (SH) wave reflection and refraction as well as active-source multichannel analysis of surface waves (MASW) and passive-source refraction microtremor (ReMi) Rayleigh wave dispersion were interpreted separately. The time-averaged shear-wave velocity to a depth of 30 m...
Journal Article
Published: 25 March 2015
Seismological Research Letters (2015) 86 (3): 1032–1039.
..., both share an east–west maximum stress direction. Recordings of the aftershock from the high‐density portion of the deployment show possible upper‐ and lower‐crustal reflections that we attempt to image using vertical seismic profiling methods. However, the lack of redundant sources and the limited...
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Journal Article
Published: 15 April 2025
Seismological Research Letters (2025)
... hard to understand the mechanism of the Maduo mainshock and causes of the two seismic gaps, mainly due to the sparse distribution of seismic stations in and around the Maduo source area. After the Maduo mainshock, 34 portable broadband MaduoArray seismic stations (Fig.  2 ) were deployed...
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Journal Article
Published: 05 June 2019
Seismological Research Letters (2019) 90 (4): 1702–1715.
... of seismicity evenly across Texas. Interstation distance for the backbone network varies from 90 to 150 km. In addition to this backbone network, 33 portable seismic‐monitoring stations were deployed to allow detailed site‐specific assessments of areas of active seismicity. The portable stations were designed...
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Journal Article
Published: 08 October 2024
Seismological Research Letters (2025) 96 (2A): 968–979.
... indicate the existence of a large magma chamber at depths of 5–13 km with shallow‐depth (>7 km) intrusions of silicic magma ( Qi and Tong, 2022 ). The near‐surface intrusions might be the source of heat for the geothermal activity in the region. The Geysers is a seismically active area. Small shallow...
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Journal Article
Published: 15 April 2025
Seismological Research Letters (2025)
... seismometers, and optical seismometers ( Bernauer et al. , 2021 ; Kislov and Gravirov, 2021 ). MEMS rotational sensor is compact, portable, and low‐cost, which is suitable for near‐field and strong earthquakes, and seismic motions induced by artificial source due to the low accuracy ( Nigbor, 1994...
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Journal Article
Published: 15 October 2014
Seismological Research Letters (2014) 85 (6): 1295–1307.
... the OhioNet four portable stations and TA O53A. The purple line represents the cumulative moment over the same time in dyn·cm. There were no detections above cross‐correlation threshold 0.85 going back to December 2012 when the station was installed. Correlation between seismic activity and maximum...
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Journal Article
Published: 09 December 2015
Seismological Research Letters (2016) 87 (1): 207–214.
...John E. Ebel ABSTRACT A swarm of 21 small earthquakes, with the largest being M Lg 1.7, was recorded by regional seismic network monitoring from near Searsport, Maine, in April and May 2011. An additional five events were detected by two portable seismic instruments that were installed...
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Journal Article
Journal: The Leading Edge
Published: 01 March 2003
The Leading Edge (2003) 22 (3): 256–260.
... the crust-mantle boundary using just land profiling; marine and onshore-offshore methods are necessary. The availability of portable instruments such as the IRIS PASSCAL pool and an air-gun ship such as the Ewing allow for these plate boundary regions to be seismically imaged with high spatial resolution...
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Journal Article
Published: 01 October 2010
Bulletin of the Seismological Society of America (2010) 100 (5A): 1904–1927.
... of the portable network, also waned. That extrusive period lasted until late January 1999, when a change in the seismic pattern marked the beginning of a new, more explosive, eruptive process. Seismic and surface activity at the Colima volcano was prolific during 1999. For clarity, we subdivide...
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Journal Article
Published: 01 January 2008
Seismological Research Letters (2008) 79 (1): 47–54.
... of acquisition modes in order to record either passive or active seismic sources. It can record data in continuous mode or in triggered modes, where trigger signals are either software triggers (data threshold, operator decision, time window) or hardware triggers (external electrical signal). The DAS operates...
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Journal Article
Published: 31 December 2019
Bulletin of the Seismological Society of America (2020) 110 (1): 270–278.
... for the detection of small magnitude earthquakes as needed for identification of active faults and source parameters in aftershock and induced earthquake studies ( McNamara, Benz, et al. , 2015 ; McNamara, Rubinstein, et al. , 2015 ; Choy et al. , 2016 ; Yeck et al. , 2016 , 2017 ; Anthony et al. , 2018...
FIGURES
Journal Article
Published: 14 January 2014
Bulletin of the Seismological Society of America (2014) 104 (1): 55–72.
... or passive ambient noise microtremor sources ( Odum et al. , 2010 ). Because this approach is limited to locations at which active measurements are undertaken, recent methods have sought to approximate V S 30 globally using topographic slope ( Allen and Wald, 2009 ). In this generalized approach high V...
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Journal Article
Published: 01 November 2021
Jour. Geol. Soc. India (2021) 97 (10): 1280–1284.
... development activities of Geophysical instruments carried at CSIR- National Geophysical Research Institute (CSIR-NGRI) such as Resistivity meter, Seismic refraction timer, Proton Precession Magnetometer (PPM), Time domain Electro Magnetic System (GS-100), Flux Gate Magnetometer, Magnetic susceptibility meter...
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Journal Article
Published: 11 April 2018
Seismological Research Letters (2018) 89 (3): 983–991.
... a magnitude of M L ∼ 1.8 . To explore the near‐surface structure of the Binchuan basin with passive and active sources, we carried out a dense seismic experiment by deploying 400 portable seismic stations in Binchuan (Fig.  1b ) from 21 March to 30 May 2017 ( Xu et al. 2018 ). The 2013 Yunxian...
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Journal Article
Published: 14 September 2022
Seismological Research Letters (2023) 94 (1): 149–158.
...Takeshi Tsuji; Shuhei Tsuji; Junji Kinoshita; Tatsunori Ikeda; Ahmad B. Ahmad Abstract We have developed a minimal Portable Active Seismic Source (PASS) system for imaging and monitoring geological formations. Stacking of the signals continuously generated by the PASS enhances the signal‐to‐noise...
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Journal Article
Published: 01 June 1969
Bulletin of the Seismological Society of America (1969) 59 (3): 1115–1135.
...° at intermediate depths in the mantle, appears to decrease in dip or bend over at depths less than about 50 km and appears to intersect the surface at or near the axis of the trench. The wedge-shaped region above the inclined seismic zone appears to be relatively aseismic, although some minor seismic activity has...