Slip of the 2004 Sumatra-Andaman Earthquake from Joint Inversion of Long-Period Global Seismic Waveforms and GPS Static Offsets

2007 ◽  
Vol 97 (1A) ◽  
pp. S115-S127 ◽  
Author(s):  
J. Rhie ◽  
D. Dreger ◽  
R. Burgmann ◽  
B. Romanowicz
Keyword(s):  
Joint Inversion ◽  
Long Period ◽  
Seismic Waveforms ◽  
Andaman Earthquake

Feature selection of seismic waveforms for long period event detection at Cotopaxi Volcano

2016 ◽  
Vol 316 ◽  
pp. 34-49 ◽  
Author(s):  
R.A. Lara-Cueva ◽  
D.S. Benítez ◽  
E.V. Carrera ◽  
M. Ruiz ◽  
J.L. Rojo-Álvarez
Keyword(s):  
Feature Selection ◽  
Event Detection ◽  
Long Period ◽  
Seismic Waveforms ◽  
Cotopaxi Volcano ◽  
Selection Of ◽  
Long Period Event

scholarly journals Extracting ground motion characteristics of distant earthquakes for mitigating displacement-sensitive equipment

2018 ◽  
Vol 37 (4) ◽  
pp. 859-880
Author(s):  
Shieh-Kung Huang ◽  
Chin-Tsun Chen ◽  
Chin-Hsiung Loh ◽  
Luh-Maan Chang
Keyword(s):  
Ground Motion ◽  
Seismic Waves ◽  
Wavelet Packet ◽  
Dominant Frequency ◽  
High Tech ◽  
Building Structures ◽  
Vibration Displacement ◽  
Long Period ◽  
Seismic Waveforms ◽  
Motion Characteristics

Ground motions induced by strong, distant earthquakes may contain extremely long-period seismic waves that have a dominant period of up to 10 s. In general, these long-period seismic waves have small amplitudes and do not endanger the safety of building structures and civil infrastructures. However, they may bring unexpected shutdown of some vibration (displacement)-sensitive equipment (such as the wafer scanners in high-tech fabs), which can cause production loss. In this study, seismic waveforms collected from broadband seismometers distributed in Taiwan were used to investigate the ground motion characteristics of the collected distant earthquakes (with an epicenter distance of over 1000 km). The time-variant dominant frequency was extracted using moving window wavelet packet transform to monitor significant long-period seismic waves from the preevent data of each seismic event. The slope of the Arias intensity and the slope index of the recorded seismic waves were also developed to detect the potential accumulation of vibration energy increasing with respect to time and amplitude. The proposed index was used to detect the features of significant distant earthquakes, and it provides a mechanism to prevent unexpected shutdown of displacement-sensitive equipment. Finally, the proposed approach is discussed in relation to the damage severity of high-tech fabs.

On nearly-commensurable periods in the restricted problem of three bodies, with calculations of the long-period variations in the interior 2:1 case

1966 ◽  
Vol 25 ◽  
pp. 197-222 ◽  
Author(s):  
P. J. Message
Keyword(s):  
Periodic Solution ◽  
Periodic Solutions ◽  
Large Amplitude ◽  
Restricted Problem ◽  
Small Amplitude ◽  
Minor Planets ◽  
Long Period ◽  
Numerical Integrations ◽  
Period Variations ◽  
The Mean

An analytical discussion of that case of motion in the restricted problem, in which the mean motions of the infinitesimal, and smaller-massed, bodies about the larger one are nearly in the ratio of two small integers displays the existence of a series of periodic solutions which, for commensurabilities of the typep+ 1:p, includes solutions of Poincaré'sdeuxième sortewhen the commensurability is very close, and of thepremière sortewhen it is less close. A linear treatment of the long-period variations of the elements, valid for motions in which the elements remain close to a particular periodic solution of this type, shows the continuity of near-commensurable motion with other motion, and some of the properties of long-period librations of small amplitude.To extend the investigation to other types of motion near commensurability, numerical integrations of the equations for the long-period variations of the elements were carried out for the 2:1 interior case (of which the planet 108 “Hecuba” is an example) to survey those motions in which the eccentricity takes values less than 0·1. An investigation of the effect of the large amplitude perturbations near commensurability on a distribution of minor planets, which is originally uniform over mean motion, shows a “draining off” effect from the vicinity of exact commensurability of a magnitude large enough to account for the observed gap in the distribution at the 2:1 commensurability.

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