The New Algorithm for Fast Probabilistic Hypocenter Locations

Dębski, Wojciech; Klejment, Piotr

doi:10.1515/acgeo-2016-0111

Cited by 3 publications

(1 citation statement)

References 56 publications

(84 reference statements)

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“…In oint event location, events are relocated according to the location of the so-called ''master event'' (Douglas 1967). Relative location methods usually improve the accuracy of source location; however, they are strongly influenced by data quality, similarly to non-relative methods of location (Rudzinski and Debski 2011;Debski and Klejment 2016). The crucial factors are determination errors of the aforementioned parameters, like P or S wave onsets.…”

Section: Introductionmentioning

confidence: 99%

Time reversal seismic source imaging using peak average power ratio (PAPR) parameter

2017

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The time reversal method has become a standard technique for the location of seismic sources. It has been used both for acoustic and elastic numerical modelling and for 2D and 3D propagation models. Although there are many studies concerning its application to point sources, little so far has been done to generalise the time reversal method to the study of sequences of seismic events. The need to describe such processes better motivates the analysis presented in this paper. The synthetic time reversal imaging experiments presented in this work were conducted for sources with the same origin time as well as for the sources with a slight delay in origin time. For efficient visualisation of the seismic wave propagation and interference, a new coefficient-peak average power ratiowas introduced. The paper also presents a comparison of visualisation based on the proposed coefficient against a commonly used visualisation based on a maximum value.

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Section: Introductionmentioning

confidence: 99%

Time reversal seismic source imaging using peak average power ratio (PAPR) parameter

2017

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Relocation of Seismic Events and Validation of Moment Tensor Inversion for SENTINELS Local Seismic Network

Białoń

Lizurek

Dec

et al. 2019

Pure Appl. Geophys.

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Seismic activity of Podhale (Poland) and Spiš (Slovakia) regions has been recognized for years. The first information about tremors from this area comes from the XVIII century. Four earthquakes, with intensity over VI in the MSK scale, were reported in 1643, 1724, 1840 and 1901. Since 1960's an instrumental measurements have been conducted. However, until 2011 no stronger tremors have been recorded in the area of artificial water reservoir Czorsztyn lake located in extremely complex geotechnical condition, between border zone of Inner and Outer Carpathians separated by Pieniny Klippen Belt. Before Czorsztyn 2D seismic survey, knowledge of tectonic boundaries and velocities was very limited. The seismic survey confirmed assumptions of a flower type faults system and provided the first 3D velocity model for this area. After a series of earthquakes, in 2013 a SENTINELS network started its operation and since that time it recorded almost 200 events. The focal mechanisms were calculated for around 20 of them. Both location and moment tensor are crucial in the investigation of the origins of seismogenic process related to industrial operations. Therefore the relocation of the events and validation of the moment tensor solutions for the SENTINELS network were conducted with the use of a 3D velocity model. The validation of mechanisms was conducted with the use of the synthetic tests based on the 1D velocity model derived from the 3D velocity model, taking into account its lateral velocity anisotropy. It was based on the synthetic amplitudes generated with the assumed normal and strike-slip faulting type, similar to the obtained solutions. The validation proved that focal mechanisms are reliable even in a sparse focal coverage and noise not exceeding 40% of the P-wave amplitude. Most of the events are normal or strike-slip with nodal planes striking NW-SE or NNE-SSW. The latter ones are in agreement with the orientation of the main discontinuities in this area.

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Rapid ground deformation corresponding to a mining-induced seismic event followed by a massive collapse

Rudziński

Mirek

Mirek³

2018

Nat Hazards

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On 17 April 2015, the Wujek/Śląsk underground coal mine in Poland was struck by a strong induced tremor of magnitude M4.0. The event was followed by a massive rock burst and a collapse of tunnels in the vicinity of the hypocentre. The earthquake was widely felt in the densely populated surrounding area. In this paper, we describe a possible connection between seismological parameters, such as the seismic source location and the focal mechanism, and the ground deformation just above the collapsed tunnels a very short time after the event occurred. We have shown that joint seismological and satellite observation can be very valuable and important tools not only to improve the knowledge concerning mining rock bursts and tunnel collapses, but also to find their influences on the ground effects observed on the surface.

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The New Algorithm for Fast Probabilistic Hypocenter Locations

Cited by 3 publications

References 56 publications

Time reversal seismic source imaging using peak average power ratio (PAPR) parameter

Time reversal seismic source imaging using peak average power ratio (PAPR) parameter

Relocation of Seismic Events and Validation of Moment Tensor Inversion for SENTINELS Local Seismic Network

Rapid ground deformation corresponding to a mining-induced seismic event followed by a massive collapse

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