Seismic data recording — The limiting component

1990 ◽  
Author(s):  
A. D. Beecroft ◽  
Albert Stienstra ◽  
A. S. Badger
Keyword(s):  
Seismic Data ◽  
Data Recording

scholarly journals An instrumental earthquake catalogue for the offshore Maltese islands region, 1995–2014

2020 ◽  
Vol 63 (Vol 63 (2020)) ◽  
Author(s):  
Matthew Agius ◽  
Pauline Galea ◽  
Daniela Farrugia ◽  
Sebastiano D'Amico
Keyword(s):  
Seismic Data ◽  
Earthquake Catalogue ◽  
Data Recording ◽  
High Concentration ◽  
Regional Networks ◽  
Regional Seismicity ◽  
Maltese Islands ◽  
Single Station ◽  
Sicily Channel ◽  
Formed Part

We present the first earthquake catalogue for Malta using 20 years of broadband seismic data recording. For about two decades Malta had only one station (WDD) which formed part of regional networks. Its location in the eastern part of the Sicily Channel puts the station at the periphery of these networks with the result that weak, off-shore earthquakes that occur between Malta and Libya, are in many cases recorded on WDD only and are undetected or unlisted by the regional networks. We adopt the single-station earthquake location method to process the continuously recorded seismic data of station WDD from 1995 to 2014. We combine our earthquake list with the bulletins of INGV and IRIS to catalogue 550 earthquakes. We statistically quantify the uncertainties of the earthquake epicentres and establish that many earthquake locations differ from INGV/IRIS locations by < 20 km at local epicentral distances from WDD and that earthquake magnitudes determined from single-station are overestimated by 0.2. We find that the Malta and Linosa grabens are seismically active, and a high concentration of seismic activity is located 80–120 km SSE of Malta at around 35◦N latitude. Closer to land, clusters of epicentres are also located, within 40 km to the east and south of Malta. This new earthquake catalogue shows that the regional seismicity is higher than previously observed and that a number of submarine structures in the area are active as part of the ongoing extension in the Sicily Channel.

Methods of correlation noise minimization and suppression for multisource acquisition in vibroseis survey

2019 ◽  
pp. 98-106
Author(s):  
A. N. Oshkin ◽  
A. I. Kon’kov ◽  
A. V. Tarasov ◽  
A. A. Shuvalov ◽  
V. I. Ignat’ev
Keyword(s):  
Seismic Data ◽  
Synthetic Data ◽  
Seismic Source ◽  
Recording System ◽  
Signal Separation ◽  
Median Filtering ◽  
Data Recording ◽  
Single Source ◽  
Correlation Noise ◽  
Incoherent Noise

The use of several simultaneously operating sources in seismic operations allows one to obtain large amounts of data per unit of time than for classical works with a single source, and also to improve the seismic data recording system. Depending on the type of seismic source used (vibrating or pulsed), different methods of signal separation are used. When working with vibroseismic method, separation of signals becomes possible at the stage of correlative processing of vibrograms. In this paper, we demonstrate methods for constructing noncorrelating signals for use in vibroseis survey (with an example of using such signals on synthetic data) and hyperbolic median filtering to minimize correlation and incoherent noise.

Land streamer for shallow seismic data acquisition: Evaluation of gimbal‐mounted geophones

Geophysics ◽  
1998 ◽  
Vol 63 (4) ◽  
pp. 1408-1413 ◽  
Author(s):  
Michiel van der Veen ◽  
Alan G. Green
Keyword(s):  
Data Acquisition ◽  
Seismic Data ◽  
Acquisition System ◽  
Environmental Applications ◽  
Data Recording ◽  
Shallow Seismic ◽  
Seismic Surveying ◽  
Acquisition Costs ◽  
Seismic Data Acquisition ◽  
Principal Advantage

To increase the speed and efficiency of shallow seismic data recording and thereby decrease acquisition costs, the concept of a towed land streamer containing self‐orienting, gimbal‐mounted geophones is being evaluated. Our initial experiments at two locations within Switzerland demonstrate that good coupling with the ground may be achieved when the gimbal‐mounted vertical geophones are contained in heavy (∼1 kg) casings and pulled along a very shallow (2–3 cm deep) furrow. Such a furrow may be created by mounting a heavy wheel on the towing vehicle. Placing the geophones in even heavier casings may provide the necessary good coupling with the ground, negating the need for the furrow. Shot gathers and stacked sections recorded with the gimbal‐mounted geophones are practically indistinguishable from those recorded with conventional spike geophones. The principal advantage of this approach is that significantly fewer field personnel (only two or three) are required than for conventional shallow seismic surveying. When fully operational, the new acquisition system should be faster and less expensive for a wide variety of engineering and environmental applications.

Uniform seismic data recording format explored

Eos ◽  
1993 ◽  
Vol 74 (37) ◽  
pp. 421
Author(s):  
Karl Fuchs
Keyword(s):  
Seismic Data ◽  
Data Recording

Formation geological depth image according to refraction and reflection marine seismic data

2017 ◽  
Vol 39 (6) ◽  
pp. 106-121
Author(s):  
A. O. Verpahovskaya ◽  
V. N. Pilipenko ◽  
Е. V. Pylypenko
Keyword(s):  
Seismic Data ◽  
Depth Image ◽  
Marine Seismic
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