1-20 OF 523 RESULTS FOR

STA/LTA

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 28 November 2017
Bulletin of the Seismological Society of America (2018) 108 (1): 230–237.
... and the ratio of short‐term and long‐term average fractal dimension, called STA/LTA fractal dimension algorithm (STAFD/LTAFD). The proposed algorithm was verified using seismic waveforms and synthesized seismic waveforms with different levels of the signal‐to‐noise ratio (SNR), and compared with both STA/LTA...
FIGURES | View All (7)
Journal Article
Published: 12 May 2015
Bulletin of the Seismological Society of America (2015) 105 (3): 1606–1618.
...Joshua P. Jones; Mirko van der Baan Abstract The most common approach to seismic triggering is to compare short‐term averages ( STA ) with long‐term averages ( LTA ) of transformed amplitudes. In recording environments where this technique is of limited use, hidden Markov models ( HMM s...
FIGURES | View All (15)
Journal Article
Published: 19 November 2013
Bulletin of the Seismological Society of America (2014) 104 (1): 394–409.
...‐bottom seismometers over a midocean ridge volcano. We compared picks from the automatic algorithm with manual and short‐term average/long‐term average ( STA / LTA )‐based automatic picks on subsets of each dataset. For the larger array, the automatic algorithm resulted in more locations than manual...
FIGURES | View All (19)
Journal Article
Published: 06 November 2019
Seismological Research Letters (2020) 91 (1): 334–342.
...Jihua Fu; Xu Wang; Zhitao Li; Hao Meng; Jianjun Wang; Wei Wang; Chengpei Tang Abstract The automatic phase‐picking detection of earthquakes is a challenge under the background of big data and strong noise circumstances. The short‐term average/long‐term average (STA/LTA) ratio is widely used...
FIGURES | View All (5)
Journal Article
Published: 01 December 1980
Bulletin of the Seismological Society of America (1980) 70 (6): 2275–2290.
... triggering algorithm consists of first measuring the ratio of the short-term signal average to the long-term signal average, with amplifier offset removed (STA/LTA ratio). When an STA/LTA trigger occurs, the number of slope reversals in the signal begin to be counted. After a preset time following the first...
Image
Results picked by the <b>STA</b>&#x2F;<b>LTA</b> fractal dimension (STAFD&#x2F;LTAFD), <b>STA</b>&#x2F;<b>LTA</b>+AIC,...
Published: 28 November 2017
Figure 7. Results picked by the STA/LTA fractal dimension (STAFD/LTAFD), STA/LTA+AIC, and manual review for the records at stations 053ZTT and 053DJL. The manual pick is the solid line, the pick of the STAFD/LTAFD algorithm is in the dashed line, and the pick by the STA/LTA+AIC algorithm
Image
<b>STA</b>&#x2F;<b>LTA</b> and MER response curves for different window sizes. (a) <b>STA</b>&#x2F;<b>LTA</b> is ...
in > Geophysics
Published: 15 March 2016
Figure 5. STA/LTA and MER response curves for different window sizes. (a) STA/LTA is computed for STA sizes (1, 2, 3) τ dom and LTA sizes (3, 5, 10, 14, 15, 21) τ dom . A dashed horizontal line is shown to demonstrate the changes in the STA/LTA responses. Smaller STA sizes
Image
<b>STA</b>&#x2F;<b>LTA</b> ratio processed data. (A) <b>STA</b>&#x2F;<b>LTA</b> with threshold 3.0 for the vespag...
Published: 01 November 2006
Figure 5. STA/LTA ratio processed data. (A) STA/LTA with threshold 3.0 for the vespagram processed data. (B) Travel time curves calculated for PREM. (C) STA/LTA with threshold 2.5 for vespagram processed data. (D) STA/LTA with threshold 2.5 for PWS processed data.
Journal Article
Journal: Geophysics
Published: 07 June 2019
Geophysics (2019) 84 (4): KS143–KS153.
...Jubran Akram; Daniel Peter; David Eaton ABSTRACT Event detection is an essential component of microseismic data analysis. This process is typically carried out using a short- and long-term-average-ratio (STA/LTA) method, which is simple and computationally efficient but often yields inconsistent...
FIGURES | View All (12)
Journal Article
Published: 26 June 2018
Bulletin of the Seismological Society of America (2018) 108 (4): 2080–2089.
... warning (EEW) system. As an existing method, short‐term average to long‐term average (STA/LTA) ratio is widely used to identify the onset time of earthquake using moving time windows. It calculates the averages of the absolute values of seismic wave in short and long windows and detects the outbreak...
FIGURES | View All (11)
Journal Article
Published: 01 October 2010
Bulletin of the Seismological Society of America (2010) 100 (5A): 1940–1951.
...) for a given ρ 1 . We apply the spectrogram detector to 1 hr of single-channel acoustic data containing a signal from a 1 lb chemical surface explosion recorded at 3.1 km distance and compare performance with a short-term average to long-term average ( STA / LTA ) detector. Both detectors are optimized through...
FIGURES | View All (11)
Journal Article
Published: 01 December 2007
Bulletin of the Seismological Society of America (2007) 97 (6): 1880–1889.
...Keith L. McLaughlin; Hans G. Israelsson; Benjamin C. Kohl Abstract We evaluate the output from the time-domain adaptive beamformer ( ABF ) developed by Shen (1979) coupled to both incoherent (short-term average/long-term average [ STA/LTA ]) and coherent F -statistic ( FSTAT ) detectors. Detection...
FIGURES | View All (9)
Journal Article
Published: 16 January 2019
Seismological Research Letters (2019) 90 (2A): 491–502.
... short‐term average/long‐term average (STA/LTA) based method ( Rietbrock et al. , 2012 ) in classifying phase onsets for a separate dataset of 3878 events throughout the same region. Based on station travel‐time residuals, the CNN outperforms the STA/LTA approach and achieves location residual...
FIGURES | View All (10)
Journal Article
Published: 08 May 2018
Bulletin of the Seismological Society of America (2018) 108 (5B): 2993–3004.
... of the spectral amplitude. Our approach does not require an assumption of normality within the recordings, and hence it is applicable to all data sets. We compare our NpD algorithm with the commonly commercially applied short‐term average/long‐term average (STA/LTA) algorithm and another highly efficient...
FIGURES | View All (6)
Journal Article
Published: 01 October 2008
Bulletin of the Seismological Society of America (2008) 98 (5): 2469–2481.
... detector, as originally formulated, requires that seismic noise is uncorrelated between the seismometers in the array. Consequently, at small-aperture (<8 km) arrays, F is often found to be no more useful than traditional detectors based on the ratio of short-term and long-term power averages ( STA/LTA...
FIGURES | View All (6)
Journal Article
Published: 01 February 1998
Bulletin of the Seismological Society of America (1998) 88 (1): 95–106.
... considered envelopes generated by energy transient (STA/LTA), Z -statistic, frequency transient, and polarization algorithms. The WCEDS system requires a set of input data streams that have a smooth, low-amplitude response to background noise and seismic coda and that contain peaks at times corresponding...
Journal Article
Published: 01 February 1995
Bulletin of the Seismological Society of America (1995) 85 (1): 308–319.
... the recursive STA/LTA time series as input data, and type B ( AND -B) uses moving window spectrograms as input data to detect earthquake signals. The two AND 's are trained under supervised learning by using a set of seismic recordings, and then the trained AND 's are applied to another set of recordings...
Journal Article
Published: 01 August 1991
Bulletin of the Seismological Society of America (1991) 81 (4): 1373–1379.
... normally distributed stochastic processes with a zero mean. The parameters of these processes were then adapted on the change of the registered signal as a function of time within a predefined detection window. The accuracy of the method presented is compared with the STA/LTA and visual methods. When...
Image
<b>STA</b>&#x2F;<b>LTA</b>  comparison for an explosion from the 2013 Pavlof eruption.  <b>STA</b>&#x2F;LT...
Published: 05 April 2016
Figure 6. STA/LTA comparison for an explosion from the 2013 Pavlof eruption. STA/LTA ratios for (a) 7–20 Hz filtered waveforms, (b) smoothed envelopes, and (c) modified spectrogram envelopes. Both envelope‐based methods produce higher STA/LTA peaks for the explosion.
Image
P-pick residuals obtained by the proposed workflow and the <b>STA</b>&#x2F;<b>LTA</b> and  Che...
in > Geophysics
Published: 30 June 2021
Figure 11. P-pick residuals obtained by the proposed workflow and the STA/LTA and Chen (2020) methods on the synthetic data sets. The residuals of the P picks initially labeled as unidentified are in green, and the residuals of picks skipped by the proposed workflow are in brown.