Tsunami Wave Dispersion

When tsunami waves propagate into shallow and gentle continental shelves, the effects of submarine topography and wave dispersion lead to the appearance of undular bore. This kind of wave is quite different from the initial tsunami wave in the waveform, and its amplitude is enhanced significantly. The undular bore will cause great and repeated runups on the beach, which brings larger destruction to the coastal region. In order to investigate the characteristics of the propagation of undular bore, this paper simulates the evolution from the sinusoidal long wave to the undular bore and analyzes the influencing factors. The beach slope has an important effect on the development of undular bores in terms of the undulation form, amplitude, wave length and occurrence time. The influence of bottom friction and submarine topography on the undulations and soliton fissions are discussed. These bottom conditions will lead to great change of the waveform and amplitude of undular bores.

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806 P wave dispersion is correlated with diastolic dysfunction in patients with sarcoidosis

EP Europace ◽

10.1016/s1099-5129(05)80547-1 ◽

2005 ◽

Vol 7 ◽

pp. 186-186

Keyword(s):

Diastolic Dysfunction ◽

Wave Dispersion ◽

P Wave ◽

P Wave Dispersion

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TO STUDY THE EFFECT OF BMV ON P WAVE DISPERSION AND SHORT TERM PROGNOSTIC IMPACT OF P WAVE DISPERSION IN PREDICTION OF CLINICAL OUTCOME AFTER PERCUTANEOUS BALLOON MITRAL VALVULOPLASTY IN PATIENTS WITH MITRAL STENOSIS AND SINUS RHYTHM

International Journal of Medical and Biomedical Studies ◽

10.32553/ijmbs.v4i9.1397 ◽

2020 ◽

Vol 4 (9) ◽

Author(s):

Ashish Kumar Agarwal ◽

Daulat Singh Meena ◽

Vijay Pathak ◽

Anoop Jain ◽

Rakesh Kumar Ola

Keyword(s):

Clinical Outcome ◽

Right Ventricular ◽

Wave Dispersion ◽

Tissue Doppler ◽

P Wave ◽

Short Term ◽

P Wave Dispersion ◽

Mitral Valvuloplasty ◽

Percutaneous Balloon ◽

Before And After

Background: The aim of the present study was to study the effect of percutaneous balloon mitral valvuloplasty (PBMV) on P wave dispersion and to test the correlation between P-maximum and P-dispersion to right ventricular function and pulmonary artery pressure before and after PMBV. Also to study the impact of P-maximum and P-wave dispersion on the short term clinical outcome after successful PBMV in patients with mitral stenosis (MS) and sinus rhythm. Methods: 75 patients undergoing PMBV were enrolled in this study. We evaluated P-maximum, P-minimum and P-wave dispersion before and one month and one year after PBMV . We studied the changes in pulmonary arterial pressure (PAP), left atrial (LA) dimension, mitral diastolic gradient, and mitral valve area, in addition to the changes in right ventricular function utilizing tissue Doppler assessment both before and after PMBV, in addition the role of the P-wave dispersion in prediction of late cardiac events. Results: There were significant decrease in mean diastolic gradient, PAP, and LA size and significant improvement in right ventricular tissue Doppler indices after PMBV. Accompany these hemodynamic changes after PMBV. P-maximum and P-wave dispersion were found to be decreased (P < 0.001). Conclusion: Successful PBMV was associated with a decrease in Pmax and PWD. These simple electrocardiographic indices may predict the success of the procedure immediately after PBMV. The P-maximum and P-wave dispersion changes were correlated with significant impairment of right dysfunction and the degree of pulmonary artery pressure. Keywords: PBMV.PAP,LA

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Wave Dispersion in Cylindrical Tubes: Applications to Hopkinson Pressure Bar Experimental Techniques

10.21236/ada428139 ◽

2004 ◽

Cited By ~ 4

Author(s):

Libo Ren ◽

Mike Larson ◽

Bazle A. Gama ◽

John W. Gillespie ◽

Jr

Keyword(s):

Wave Dispersion ◽

Experimental Techniques ◽

Hopkinson Pressure Bar ◽

Cylindrical Tubes ◽

Pressure Bar

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Improved Surface Wave Dispersion Models, Amplitude Measurements and Azimuth Estimates

10.21236/ada438946 ◽

2005 ◽

Cited By ~ 2

Author(s):

Jeffry L. Stevens ◽

David A. Adams ◽

G. E. Baker ◽

Mariana G. Eneva ◽

Heming Xu

Keyword(s):

Surface Wave ◽

Wave Dispersion ◽

Dispersion Models ◽

Surface Wave Dispersion

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STUDY ON TSUNAMI WAVE PRESSURE OF REGULARLY-ARRANGED CYLINDRES

Journal of Japan Society of Civil Engineers Ser B2 (Coastal Engineering) ◽

10.2208/kaigan.74.i_259 ◽

2018 ◽

Vol 74 (2) ◽

pp. I_259-I_264

Author(s):

Akio NAGAYAMA ◽

Tomotaka TANAKA ◽

Ryouga SAKAGUCHI ◽

Ryoudai SUEYOSHI ◽

Toshiyuki ASANO

Keyword(s):

Tsunami Wave ◽

Wave Pressure

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Imaging the subsurface using induced seismicity and ambient noise: 3-D tomographic Monte Carlo joint inversion of earthquake body wave traveltimes and surface wave dispersion

Geophysical Journal International ◽

10.1093/gji/ggaa230 ◽

2020 ◽

Vol 222 (3) ◽

pp. 1639-1655

Author(s):

Xin Zhang ◽

Corinna Roy ◽

Andrew Curtis ◽

Andy Nowacki ◽

Brian Baptie

Keyword(s):

Surface Wave ◽

Ambient Noise ◽

Velocity Structure ◽

Joint Inversion ◽

Body Wave ◽

Source Parameters ◽

Wave Dispersion ◽

Inversion Method ◽

Surface Wave Dispersion ◽

Wave Data

SUMMARY Seismic body wave traveltime tomography and surface wave dispersion tomography have been used widely to characterize earthquakes and to study the subsurface structure of the Earth. Since these types of problem are often significantly non-linear and have non-unique solutions, Markov chain Monte Carlo methods have been used to find probabilistic solutions. Body and surface wave data are usually inverted separately to produce independent velocity models. However, body wave tomography is generally sensitive to structure around the subvolume in which earthquakes occur and produces limited resolution in the shallower Earth, whereas surface wave tomography is often sensitive to shallower structure. To better estimate subsurface properties, we therefore jointly invert for the seismic velocity structure and earthquake locations using body and surface wave data simultaneously. We apply the new joint inversion method to a mining site in the United Kingdom at which induced seismicity occurred and was recorded on a small local network of stations, and where ambient noise recordings are available from the same stations. The ambient noise is processed to obtain inter-receiver surface wave dispersion measurements which are inverted jointly with body wave arrival times from local earthquakes. The results show that by using both types of data, the earthquake source parameters and the velocity structure can be better constrained than in independent inversions. To further understand and interpret the results, we conduct synthetic tests to compare the results from body wave inversion and joint inversion. The results show that trade-offs between source parameters and velocities appear to bias results if only body wave data are used, but this issue is largely resolved by using the joint inversion method. Thus the use of ambient seismic noise and our fully non-linear inversion provides a valuable, improved method to image the subsurface velocity and seismicity.

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