Automatic Picker Developments and Optimization: FilterPicker--a Robust, Broadband Picker for Real-Time Seismic Monitoring and Earthquake Early Warning

Lomax, Anthony; Satriano, Claudio; Vassallo, Maurizio

doi:10.1785/gssrl.83.3.531

Cited by 168 publications

(99 citation statements)

References 19 publications

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“…In practice multiple peaks between subsequent P and S arrivals might be an issue for earthquake location (there are no such limitations with shift and stack methods, Kao and Shan, 2004;Zahradník et al, 2015). Time derivative and Kurtosis have been shown as reliable onset indicators for seismic wave detection (Baer and Kradolfer, 1987;Lomax et al, 2012); their maximum in the vicinity of the probability peak should give best estimates of arrival times.…”

Section: Discussionmentioning

confidence: 99%

“…To adapt to multiple earthquake magnitudes and distances, we use a multi-scale calculation of the C f following (Lomax et al, 2012). The signal is first decomposed using high pass filters which are then used for running mean and rms calculations.…”

Section: Multi-scalingmentioning

confidence: 99%

“…they have an uninformed prior. They often rely on variants of the Short Term -Long Term averages ratio algorithm (S T /L T is used in Earthworm and SeisComP3; Allen, 1982;Baer and Kradolfer, 1987;Lomax et al, 2012). In this method, the ratio of two running means (one short and one long time scale) increases with amplitude changes.…”

Section: Introductionmentioning

confidence: 99%

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A better automatic body-wave picker with broad applicability

Massin

Malcolm

2016

SEG Technical Program Expanded Abstracts 2016

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SUMMARYFor robust earthquake analysis, we need efficient and reliable automatic body-wave recognition methods. To do this, we combine the advantages of standard methods in an innovative and generalized approach. Using the component energy correlation method, we demonstrate the mathematical and practical advantages of the correlation operator and apply this operator to theS T /L T andRP/LP methods. We also implement multiscale versions of these methods to reduce the dependence on user-defined time-scale parameters. We compare our results systematically to different methods, propose an optimal approach and demonstrate its reliability.

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Section: Discussionmentioning

confidence: 99%

Section: Multi-scalingmentioning

confidence: 99%

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A better automatic body-wave picker with broad applicability

Massin

Malcolm

2016

SEG Technical Program Expanded Abstracts 2016

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“…This effect was proposed as a seismic event trigger, because the noise was shown to display a Gaussian behavior very different from the first digit phenomenon. The practical consequences of this property are far reaching, because seismic localization algorithms and early warning methods depend on the ability to detect with precision the arrival time of seismic signals (Allen and Kanamori, 2003;Lancieri et al, 2011;Lomax et al, 2012). Our insight is that this property of the earthquake arrival is directly related to the seismic source and related processes.…”

Section: The Tohoku Earthquake From the Point Of View Of The First Digitmentioning

confidence: 93%

Earthquake source parameters that display the first digit phenomenon

Toledo¹,

Riquelme²,

Campos³

2015

Nonlin. Processes Geophys.

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Abstract. We study the main parameters of earthquakes from the perspective of the first digit phenomenon: the nonuniform probability of the lower first digit different from 0 compared to the higher ones. We found that source parameters like coseismic slip distributions at the fault and coseismic inland displacements show first digit anomaly. We also found the tsunami runups measured after the earthquake to display the phenomenon. Other parameters found to obey first digit anomaly are related to the aftershocks: we show that seismic moment liberation and seismic waiting times also display an anomaly. We explain this finding by invoking a selforganized criticality framework. We demonstrate that critically organized automata show the first digit signature and we interpret this as a possible explanation of the behavior of the studied parameters of the Tohoku earthquake.

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“…The parameters of the picking algorithm, developed by Lomax et al (2012), were configured with a filter window of 32 s, long-term window of 10 s, and the thresholds of 15 and 20 s. The binder was configured with 15 s for coincidence and 90 s for association. This software also provides a quick estimation of the magnitude based on the P-wave peak displacement and a probabilistic Bayesian method (Lancieri et al, 2011) configured as default.…”

Section: Seismic Softwarementioning

confidence: 99%

A Regional Approach for Earthquake Early Warning in South West Iberia: A Feasibility Study

Pazos¹,

Romeu²,

Lozano³

et al. 2015

Bulletin of the Seismological Society of America

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A Spanish ALERT-ES project was set up to study the feasibility of setting up an earthquake early warning system to warn of potentially damaging earthquakes that can occur in the Cape of San Vicente (SV)-Gulf of Cadiz (GC) area, located in the south west of the Iberian Peninsula, such as the 1755 Lisbon earthquake. Four events, located close to the epicenters of the largest earthquakes in the area, were simulated using different seismic software packages (Earthworm, SeisComP3, and PRobabilistic and Evolutionary early warning SysTem [PRESTo]) and the errors were analyzed. In addition, a study about the blind zone and the lead time at six selected targets was carried out. The results show a blind zone in the southwest corner of Portugal for SV earthquakes and also a blind zone in the coastal area, from Portimao to Cadiz, for the GC earthquakes.

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Automatic Picker Developments and Optimization: FilterPicker--a Robust, Broadband Picker for Real-Time Seismic Monitoring and Earthquake Early Warning

Cited by 168 publications

References 19 publications

A better automatic body-wave picker with broad applicability

A better automatic body-wave picker with broad applicability

Earthquake source parameters that display the first digit phenomenon

A Regional Approach for Earthquake Early Warning in South West Iberia: A Feasibility Study

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