Preliminary body-wave analysis of the St. Elias, Alaska earthquake of February 28, 1979

abstract Employing a new technique for the body-wave analysis of shallow-focus earthquakes, we have made a preliminary analysis of the St. Elias, Alaska earthquake of February 28, 1979, using five long-period P and S waves recorded at three WWSSN stations and at Palisades, New York. Using a well determined focal mechanism and an average source depth of ≈ 11 km, the interference of the depth phases (i.e., pP and sP, or sS) has been deconvolved from the recorded pulse shapes to obtain velocity and displacement pulse shapes as they would appear if the earthquake had occurred within an infinite medium. These “approximate whole space” pulse shapes indicate that the rupture contained three distinct subevents as well as a small initial event which preceded this subevent sequence by about 7 sec. From the pulse rise times of the subevents, their rupture lengths are estimated as 12, 27, and 17 km, assuming that the subevent rupture velocity was 3 km/sec. Overall, the earthquake ruptured ≈ 60 km to the southeast with an average rupture velocity of 2.2 km/sec. The cumulative body-wave moment for the whole event, 1.2 × 1027 dyne-cm, is substantially smaller than the surface-wave moments reported by Lahr et al. (1979) of 5 × 1027 dyne-cm. The moments of the subevents are estimated to be 0.6, 3.2, and 7.5 × 1026 dyne-cm, respectively.

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The amplitude spectra of P- and S-waves and the body-wave magnitude of earthquakes

Tectonophysics ◽

10.1016/0040-1951(82)90150-0 ◽

1982 ◽

Vol 84 (1) ◽

pp. 17-32 ◽

Cited By ~ 5

Author(s):

R Nortmann ◽

S.J Duda

Keyword(s):

Body Wave ◽

The Body ◽

S Waves ◽

Amplitude Spectra ◽

Body Wave Magnitude

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The partition of radiated energy between P and S waves

Bulletin of the Seismological Society of America ◽

10.1785/bssa0740020361 ◽

1984 ◽

Vol 74 (2) ◽

pp. 361-376

Author(s):

John Boatwright ◽

Jon B. Fletcher

Keyword(s):

Wave Energy ◽

Body Wave ◽

Focal Mechanisms ◽

The Body ◽

Body Waves ◽

P Wave ◽

Corner Frequency ◽

S Wave ◽

S Waves ◽

Radiated Energy

Abstract Seventy-three digitally recorded body waves from nine multiply recorded small earthquakes in Monticello, South Carolina, are analyzed to estimate the energy radiated in P and S waves. Assuming Qα = Qβ = 300, the body-wave spectra are corrected for attenuation in the frequency domain, and the velocity power spectra are integrated over frequency to estimate the radiated energy flux. Focal mechanisms determined for the events by fitting the observed displacement pulse areas are used to correct for the radiation patterns. Averaging the results from the nine events gives 27.3 ± 3.3 for the ratio of the S-wave energy to the P-wave energy using 0.5 〈Fi〉 as a lower bound for the radiation pattern corrections, and 23.7 ± 3.0 using no correction for the focal mechanisms. The average shift between the P-wave corner frequency and the S-wave corner frequency, 1.24 ± 0.22, gives the ratio 13.7 ± 7.3. The substantially higher values obtained from the integral technique implies that the P waves in this data set are depleted in energy relative to the S waves. Cursory inspection of the body-wave arrivals suggests that this enervation results from an anomalous site response at two of the stations. Using the ratio of the P-wave moments to the S-wave moments to correct the two integral estimates gives 16.7 and 14.4 for the ratio of the S-wave energy to the P-wave energy.

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Source processes of the 1981 Gulf of Corinth earthquake sequence from body-wave analysis

Bulletin of the Seismological Society of America ◽

10.1785/bssa0740020459 ◽

1984 ◽

Vol 74 (2) ◽

pp. 459-477

Author(s):

Won-Young Kim ◽

Ota Kulhánek ◽

Klaus Meyer

Keyword(s):

Main Shock ◽

Body Wave ◽

The Body ◽

Body Waves ◽

Earthquake Sequence ◽

Wave Analysis ◽

Normal Faulting ◽

Source Characteristics ◽

Gulf Of Corinth ◽

Stress Drops

Abstract Teleseismic long-period body waves from the 24 February 1981 Gulf of Corinth earthquake and its two principal aftershocks of 25 February (02h35m) and 4 March (21h58m) 1981 are studied to determine source characteristics. Focal mechanisms, along with observed surface fault breaks, suggest that the Corinth earthquake sequence represents normal faulting due to the N-S trending extension. Depths of the three shocks, estimated by matching synthetic seismograms to observations, are found to lie between 4 and 12 km. The azimuthal variation of observed body-wave duration indicates that the main shock is a multiple event and that the main rupture occurred about 3 to 4 sec after a relatively small foreshock and propagated toward the W-NW. Seismic moments deduced from the body-wave synthetics are 8.1 ×1025, 2.7 ×1025, and 2.2 ×1025 dyne-cm for the main, 25 February and 4 March shocks, respectively. Average final displacements and stress drops are estimated to be 37 cm and 10 bars for the main shock (for a circular fault of radius 15 km); 22 cm and 8 bars for the 25 February shock, and 18 cm and 7 bars for the 4 March shock (for circular faults of radius 11 km). The striking features of the earthquake sequence are the low stress drops of the main shock and its two principal aftershocks, and the clear eastward migration of aftershock activities. The unusually long source-time function rise times (4 sec for the main shock, 2.5 sec for both aftershocks) and low stress drops suggest an overall slow energy release during the earthquake sequence.

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Review of: Reiko Ohnuma, Head, Eyes, Flesh and Blood: Giving Away the Body in Indian Buddhist Literature, (New York: Columbia University Press, 2007)

Buddhist Studies Review ◽

10.1558/bsrv.v25i2.257 ◽

2008 ◽

Vol 25 (2) ◽

pp. 257-258

Author(s):

Dr Naomi Appleton

Keyword(s):

New York ◽

The Body ◽

Columbia University ◽

Buddhist Literature

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Reviews

Screen Bodies ◽

10.3167/screen.2018.030207 ◽

2018 ◽

Vol 3 (2) ◽

pp. 86-98

Author(s):

Josh Morrison ◽

Sylvie Bissonnette ◽

Karen J. Renner ◽

Walter S. Temple

Keyword(s):

New York ◽

New Media ◽

The Body ◽

Media Art ◽

University Of Minnesota ◽

Body Images ◽

New Media Art

Kate Mondloch, A Capsule Aesthetic: Feminist Materialisms in New Media Art (Minneapolis: University of Minnesota Press, 2018), 151 pp. ISBN: 9781517900496 (paperback, $27) Alberto Brodesco and Federico Giordano, editors, Body Images in the Post-Cinematic Scenario: The Digitization of Bodies (Milan: Mimesis International, 2017). 195 pp., ISBN: 9788869771095 (paperback, $27.50) Cynthia J. Miller and A. Bowdoin Van Riper, editors, What’s Eating You? Food and Horror on Screen (New York: Bloomsbury Academic, 2017). 370pp., ISBN: 9781501322389 (hardback, $105); ISBN: 9781501343964 (paperback, $27.96); ISBN: 9781501322419 (ebook, $19.77) Kaya Davies Hayon, Sensuous Cinema: The Body in Contemporary Maghrebi Cinema (New York: Bloomsbury, 2018). 181pp., ISBN: 9781501335983 (hardback, $107.99)

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Experimental Production of the Bi-Digital O-Ring Test Muscular Power Evaluation Device Using an Air-type Automatic Analysis System

Acupuncture & Electro-Therapeutics Research ◽

10.3727/036012920x15958782196808 ◽

2020 ◽

Vol 45 (1) ◽

pp. 15-30

Author(s):

Yasuhiro Shimotsuura ◽

Hiroyuki Maezawa ◽

Yoshiaki Omura

Keyword(s):

New York ◽

Muscle Strength ◽

Objective Evaluation ◽

The Body ◽

Ring Test ◽

Experimental Production ◽

Muscular Power ◽

Strong Response ◽

Staff Members ◽

Diagnosis Method

As Bi-Digital O-Ring Test (originated and founded by Prof. Y. Omura in New York, 1997-2020; follow as BDORT)is a diagnosis method that is carried out on the basic theory of the physiological phenomenon called the decline of muscular power of fingers, the examiner, and patients (or mediator) are demanded to do BDORT by constant regular power. Namely BDORT is a diagnosis method that estimates the relative muscular decline of the patients, so there is such a view that the results of BDORT are reflected by consciousness of the examiner. The authors used the ORT tester by using air system to avoid the influence of electromagnetic wave and evaluated the decline of the muscle strength and open degree of the O-ring shaped by the patients. Patients of the Shimotsuura Clinic are subjected and checked by direct BDORT method. When the patients shapes the O-Ring, staff members stimulated the parts of the body by plastic stick and push foot switch. Decline of the muscle strength & open degree was evaluated. When the open degree was more than 20%, stimulated points were evaluated as abnormal. Opposite side arm of the O-Ring shaped arm was checked as control. The results of the direct BDORT method between ORT evaluation apparatus and the patient was consistent with the results of the indirect method of BDORT method between the doctor and the assistant. Even where the patients complain of ill, the muscle strength was declined and opened the O-Ring by using ORT evaluation apparatus. Especially in the parts of the strong response of Integrin α5β1 checked by the doctor, the muscle strength decreased and the open degree was much higher than other parts of the body. Patients could experience of BDORT by numeral objective evaluation of the decline of the muscle strength by using ORT evaluation apparatus.

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