85.17 The HYPO71 earthquake location program

Lee, W.H.K.; Lahr, John C.; Valdés, Carlos

doi:10.1016/s0074-6142(03)80296-6

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…1. The location was made with HYPOPC71 code (Lee and Valdés, 1985;Lee et al, 2003) and the crustal model of Fig. 2, hereafter denoted R (Rigo et al, 1996), routinely employed in the CRL network.…”

Section: Event 20021203: Inconsistency Between Location and Moment-tementioning

confidence: 99%

Shallow earthquakes: Shallower than expected?

2009

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Section: Event 20021203: Inconsistency Between Location and Moment-tementioning

confidence: 99%

Shallow earthquakes: Shallower than expected?

2009

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“…Many scholars have conducted in-depth research on the iterative idea of the Geiger method. Lee et al developed the HYPO71 and HYPO78-81 series of microseismic location programs and pioneered the use of computer location [9]. In addition, many scholars combine the Geiger method with other methods to improve the accuracy of the location.…”

Section: Introductionmentioning

confidence: 99%

Automated Locating Mining-Induced Microseismicity without Arrival Picking by Weighted STA/LTA Traces Stacking

2020

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The automatic location of the microseismic source is still a challenging endeavor in the microseismic field. Due to the complexity of the mining environment, the microseismic records collected by different channels vary, and generally have a low signal-to-noise ratio (SNR). Therefore, the automatic location algorithm is required to be robust and accurate. For microseismic records with low SNR, the stack-based method does not need to pick arrival, thus avoiding the large location error caused by picking arrival. However, the traditional stack-based method does not consider the influence of the waveform quality of different stations, which can bring some errors to the location result. In this paper, in order to improve the location accuracy of the traditional stack-based method, we propose a method for weighted STA/LTA traces stacking. First, we established evaluation indicators of waveform quality based on microseismic records. Then, the STA/LTA traces are given weight to stack according to the evaluation indicators. Finally, the maximum value of the stacking function is solved in the four-dimensional space to obtain the source coordinates. In the process of calculation, we use the weighted differential evolution (WDE) optimal algorithm instead of the full grid search method, which greatly improves the calculation efficiency. The blasting experiment and engineering application show that the proposed method is stable and effective, and the location accuracy is higher than the traditional stack-based method and the arrival-based method.

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The first 30 min hidden aftershocks of the 2022 September 17, ML 6.4, Guanshan, Taiwan earthquake and its seismological implications

Huang,

Ku,

Lin

et al. 2024

Terr Atmos Ocean Sci

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The first 30 min of the aftershock sequence following the 2022 September 17, ML 6.4, Guanshan, Taiwan earthquake is investigated by the back-projection (BP) method. Based on the Automatic Gain Control (AGC) to process individual earthquake record and sort waveforms by epicentral distance, 80 events are identified near the Guanshan earthquake epicenter to verify its temporal variation. However, most of these events cannot clearly image by the BP method to determine its spatial locations for its small amplitude and short time separation. In total, 29 aftershocks are imaged by this study to identify its spatial locations during this time period. The relocated events are compared with the Central Weather Bureau (CWB) rapid report catalogue. Only 5 events have been reported by the CWB rapid report catalogue. These unreported hidden aftershocks are identified to distribute surrounding the epicenter and extended to the east. This extracted information of hidden aftershocks is crucial for assessing the potential for future large aftershocks and estimating the associated seismic hazards in a given region, and provide extra message to evaluate the source physics in general.

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85.17 The HYPO71 earthquake location program

Cited by 5 publications

References 2 publications

Shallow earthquakes: Shallower than expected?

Shallow earthquakes: Shallower than expected?

Automated Locating Mining-Induced Microseismicity without Arrival Picking by Weighted STA/LTA Traces Stacking

The first 30 min hidden aftershocks of the 2022 September 17, ML 6.4, Guanshan, Taiwan earthquake and its seismological implications

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