Did the 2004 Sumatra-Andaman Earthquake Involve a Component of Tsunami Earthquakes?

2007 ◽  
Vol 97 (1A) ◽  
pp. S296-S306 ◽  
Author(s):  
T. Seno ◽  
K. Hirata
Keyword(s):  
Tsunami Earthquakes ◽  
Andaman Earthquake

scholarly journals Rapid estimation of tsunami earthquake magnitudes at local distance

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Akio Katsumata ◽  
Masayuki Tanaka ◽  
Takahito Nishimiya
Keyword(s):  
Magnitude Estimation ◽  
Seismic Wave ◽  
Seismic Waves ◽  
Wave Amplitude ◽  
Amplitude Distribution ◽  
Distribution Method ◽  
Finite Fault ◽  
Tsunami Earthquakes ◽  
Tsunami Earthquake ◽  
The Moment

AbstractA tsunami earthquake is an earthquake event that generates abnormally high tsunami waves considering the amplitude of the seismic waves. These abnormally high waves relative to the seismic wave amplitude are related to the longer rupture duration of such earthquakes compared with typical events. Rapid magnitude estimation is essential for the timely issuance of effective tsunami warnings for tsunami earthquakes. For local events, event magnitude estimated from the observed displacement amplitudes of the seismic waves, which can be obtained before estimation of the seismic moment, is often used for the first tsunami warning. However, because the observed displacement amplitude is approximately proportional to the moment rate, conventional magnitudes of tsunami earthquakes estimated based on the seismic wave amplitude tend to underestimate the event size. To overcome this problem, we investigated several methods of magnitude estimation, including magnitudes based on long-period displacement, integrated displacement, and multiband amplitude distribution. We tested the methods using synthetic waveforms calculated from finite fault models of tsunami earthquakes. We found that methods based on observed amplitudes could not estimate magnitude properly, but the method based on the multiband amplitude distribution gave values close to the moment magnitude for many tsunami earthquakes. In this method, peak amplitudes of bandpass filtered waveforms are compared with those of synthetic records for an assumed source duration and fault mechanism. We applied the multiband amplitude distribution method to the records of events that occurred around the Japanese Islands and to those of tsunami earthquakes, and confirmed that this method could be used to estimate event magnitudes close to the moment magnitudes.

What Is Tsunami Earthquake?

2021 ◽  
Author(s):  
Toshikazu Ebisuzaki
Keyword(s):  
Surface Waves ◽  
Seismic Waves ◽  
Submarine Landslides ◽  
Lower Efficiency ◽  
Tsunami Waves ◽  
Tsunami Earthquakes ◽  
Seismic Surface Waves ◽  
Tsunami Earthquake ◽  
Volcanic Islands ◽  
2004 Tsunami

Abstract A tsunami earthquake is defined as an earthquake which induces abnormally strong tsunami waves compared with its seismic magnitude (Kanamori 1972; Kanamori and Anderson 1975; Tanioka and Seno 2001). We investigate the possibility that the surface waves (Rayleigh, Love, and tsunami waves) in tsunami earthquakes are amplified by secondly submarine landslides, induced by the liquefaction of the sea floor due to the strong vibrations of the earthquakes. As pointed by Kanamori (2004), tsunami earthquakes are significantly stronger in longer waves than 100 s and low in radiation efficiencies of seismic waves by one or two order of magnitudes. These natures are in favor of a significant contribution of landslides. The landslides can generate seismic waves with longer period with lower efficiency than the tectonic fault motions (Kanamori et al 1980; Eissler and Kanamori 1987; Hasegawa and Kanamori 1987). We further investigate the distribution of the tsunami earthquakes and found that most of their epicenters are located at the steep slopes in the landward side of the trenches or around volcanic islands, where the soft sediments layers from the landmass are nearly critical against slope failures. This distribution suggests that the secondly landslides may contribute to the tsunami earthquakes. In the present paper, we will investigate the rapture processes determined by the inversion analysis of seismic surface waves of tsunami earthquakes can be explained by massive landslides, simultaneously triggered by earthquakes in the tsunami earthquakes which took place near the trenches.

scholarly journals Slow slip below Port Blair, Andaman, during the great Sumatra-Andaman earthquake of 26 December 2004

2006 ◽  
Vol 33 (3) ◽  
Author(s):  
S. K. Singh ◽  
M. Ortiz ◽  
H. K. Gupta ◽  
D. G. A. Ramadass
Keyword(s):  
Slow Slip ◽  
Andaman Earthquake

scholarly journals EQUILIBRIUM OF ECOLOGY AND ENGLISH CHALLENGES FOR TOMORROW’S LEADERS: A STUDY

2017 ◽  
Vol 4 (1) ◽  
pp. 5-7
Author(s):  
Chinnadurai T ◽  
Nagaraj P
Keyword(s):  
Childhood Obesity ◽  
Transfer Students ◽  
Ecological System ◽  
Environmental Action ◽  
English Teacher ◽  
Air Conditioner ◽  
Next Generation ◽  
Language Classroom ◽  
Tsunami Earthquakes ◽  
Better Than

The vision of the greenish world refashions lightning into brownish ground. When our human minds enlarge, our souls and hearts become brownie and narrow. Our world is expected to face massive calamities which have already given enough signs to be aware of disasters like Tsunami, earthquakes, global warmingand less prime span of living. According to the poet W.H. Auden “a culture is no better than its woods”.Today’s children are being taught how to cut away the trees and build fine air conditioner rooms. Being an English teacher, one has the greatest responsibility in language classroom in molding the future leaders. If we do not care of our square classroom today, our circle globe will be no more for next generation. Only our four pillars of classroom are to shape our Earth. Students are facing many problems in indoor learning like attention difficulties, diminished use of sense, hyperactivity, and childhood obesity and disconnection from real things. English teacher has to have the efficiency to transfer students’ ability into positive environmental action to preserve our earth as over grown living areas. It’s our responsibility to grow our children with greenish perspective. This paper focuses how to develop our ecological system through English fortomorrow’s leaders.

Sign in / Sign up

Export Citation Format

Share Document