Observations from the IDA network of attenuation and splitting during a recent earthquake

Buland, Ray; Berger, Jonathan; Gilbert, Freeman

doi:10.1038/277358a0

Cited by 90 publications

(54 citation statements)

References 7 publications

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“…We can see that individual record estimates often have smaller errors than previous estimates using a multiple event stripping technique [Ritzwoller et al, 1986] of more than 100 IDA gravimeter records or multiple taper and stacking of 7 IDA records of the 1977 Indonesian event [Lindberg, 1986]. The mean of the five singlet frequencies at ST and KA has smaller errors than the value obtained by Buland et al [1979] using a stack of 6 IDA records of the 1977 Indonesian event. The mean frequency obtained here from the analysis of SG data is smaller than the PREM value while the mean frequencies obtained by Buland et al [1979], Lindberg [1986] and Ritzwoller et al [1986] are greater than PREM prediction.…”

Section: Comparison With the 2001 M W = 84 Peru Eventmentioning

confidence: 74%

High‐resolution analysis of the gravest seismic normal modes after the 2004 M_w = 9 Sumatra earthquake using superconducting gravimeter data

Rosat

2005

Geophysical Research Letters

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[1] The M w > 9 Sumatra-Andaman earthquake on December 26, 2004 has strongly excited the lowfrequency seismic modes and is a unique opportunity to improve the frequency and damping measurements of the gravest seismic modes. The precise estimation of the frequency splitting of the seismic modes below 1 mHz is needed to improve 1D-density models of the Earth. From this event, 2 S 1 is observed for the first time without any stacking on both SG (Superconducting Gravimeter) and seismic records. We report here analyses of SG data obtained from 11 sites. The spectra of SG records clearly show the splitting of 0 S 2 into 5 completely resolved singlets and the splitting of 0 S 3 into 7 singlets at individual stations. The present results demonstrate that SGs provide high quality data for a precise analysis of the low-frequency seismic modes.

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Section: Comparison With the 2001 M W = 84 Peru Eventmentioning

confidence: 74%

High‐resolution analysis of the gravest seismic normal modes after the 2004 M_w = 9 Sumatra earthquake using superconducting gravimeter data

Rosat

2005

Geophysical Research Letters

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“…The 0 S 2 multiplet lies in the range 300.0 to 318.5 µHz (55.6 to 52.3 min) (Buland et al, 1979) and is shown in Fig. 1.…”

Section: Discussionmentioning

confidence: 99%

Statistical study of seismic and ground pressure oscillations with steady frequencies in the 0.7–5 h period range

2002

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Abstract. Product spectra of ground pressure variation and seismic oscillations have been calculated in the period subranges of 42-90 min and 2.5-5 h, based on synchronous, colocated microbarograph and seismograph measurements at St. Petersburg (60 • N, 30 • E). The 200 records of 2-3.5 days in length and a combined duration of 525 days have been used. The product spectra have been computed for winter, spring, summer, and autumn, both individually and in combination. The spectra of different seasons are distinct from each other for both microbarograph and seismograph measurements; this can be caused by a seasonal variation in both frequency and amplitude of free oscillations of the atmosphere. There are pressure and seismic oscillations with close frequencies in the spectra for both, for each season and when all seasons are combined. At present, suggestions may only be made regarding the origin of most of these common oscillations. Once again, the penetration of the Earth's free oscillation 0 S 2 with a period of about 54 min into the atmosphere has been confirmed. A common pressure and seismic oscillation with the 206 min period has been detected and has attracted considerable interest. The 159-min periodicity revealed in pressure variations may be associated with the well-known solar oscillation of the 160.01 min period.

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“…The frequencies of the 0 S 2 mode components are 0.3000, 0.3048, 0.3095, 0.3140, 0.3185 mHz for m À2Y À1Y 0Y 1Y 2, respectively (Buland et al, 1979). The analysis of seismograph records, as a rule, makes possible to detect only some of the ®ve components (e.g., Lin'kov et al, 1991).…”

Section: Determination Of Phase Dierencementioning

confidence: 99%

“…Buland et al, 1979;Aki and Richards, 1980). Here k is the number of nodes between the surface and center of the Earth for the radial wave function of the mode.…”

Section: Determination Of Phase Dierencementioning

confidence: 99%

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Penetration of the Earth's free oscillations at 54 minute period into the atmosphere

Shved

Petrova

Polyakova

2000

Annales Geophysicae

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Abstract. It is known that the fundamental spheroidal mode 0 S 2 of the Earth free oscillation with a period of about 54 min forces atmospheric oscillations. We present a certain phase relationship for components of the 0 S 2 multiplet, which is based on synchronous collocated microbarograph and seismograph observations. This relationship is both the ®rst observational manifestation of the Pekeris mode of global atmospheric oscillations with the 54 min period and a further proof of the Earth's 0 S 2 mode penetrating into the atmosphere. We show that the linear non-dissipative model of steady forced oscillations in isothermal atmosphere at rest does not describe the penetration of the 0 S 2 mode into the atmosphere adequately.

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Observations from the IDA network of attenuation and splitting during a recent earthquake

Cited by 90 publications

References 7 publications

High‐resolution analysis of the gravest seismic normal modes after the 2004 M_w = 9 Sumatra earthquake using superconducting gravimeter data

High‐resolution analysis of the gravest seismic normal modes after the 2004 M_w = 9 Sumatra earthquake using superconducting gravimeter data

Statistical study of seismic and ground pressure oscillations with steady frequencies in the 0.7–5 h period range

Penetration of the Earth's free oscillations at 54 minute period into the atmosphere

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Observations from the IDA network of attenuation and splitting during a recent earthquake

Cited by 90 publications

References 7 publications

High‐resolution analysis of the gravest seismic normal modes after the 2004 Mw = 9 Sumatra earthquake using superconducting gravimeter data

High‐resolution analysis of the gravest seismic normal modes after the 2004 Mw = 9 Sumatra earthquake using superconducting gravimeter data

Statistical study of seismic and ground pressure oscillations with steady frequencies in the 0.7–5 h period range

Penetration of the Earth's free oscillations at 54 minute period into the atmosphere

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High‐resolution analysis of the gravest seismic normal modes after the 2004 M_w = 9 Sumatra earthquake using superconducting gravimeter data

High‐resolution analysis of the gravest seismic normal modes after the 2004 M_w = 9 Sumatra earthquake using superconducting gravimeter data