Possible Tsunami Model for Recent 7.1 Aftershock and Delayed Effect at Same Site

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In summary: The 7.1 magnitude earthquake that struck the same area one month later may not be a coincidence, and may be the precursor to another earthquake. This is due to the fact that the earthquake was located in a region that is known to be seismically active, and the earthquake was also of a magnitude that is typically associated with earthquakes in this area. However, it is not yet possible to say with certainty that this is the case, as there are still a number of factors that must be considered before making a judgement. The delayed effect of the tsunami may also be due to the fact that the sea bottom was shaken before the water reached the open oceanic side, which is what accounts for the delay. Hydrodynamic simulations may be able
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cph
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Might the recent 7.1 ‘aftershock’ at same site one month later, actually be a for shock of another pending earthquake?

Also might the delayed tsunami effect have been due to saucer sloshing effect? That is, if the sea bottom (saucer) is shaken, then water first sloshes towards the more open oceanic side, and then secondarily sloshes back to landslide; hence accounting for the delay? Might hydrodynamic simulations be of help? Hence would neither an ocean volume changing effect, nor an impulse effect be necessitated for this tsunami generation?
 
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cph said:
Might the recent 7.1 ‘aftershock’ at same site one month later, actually be a for shock of another pending earthquake?

Also might the delayed tsunami effect have been due to saucer sloshing effect? That is, if the sea bottom (saucer) is shaken, then water first sloshes towards the more open oceanic side, and then secondarily sloshes back to landslide; hence accounting for the delay? Might hydrodynamic simulations be of help? Hence would neither an ocean volume changing effect, nor an impulse effect be necessitated for this tsunami generation?
We don't have sufficiently detailed models of the subocean crust to predict earthquakes, nor their magnitude, location, or orientation. All the details come after the fact.

The 7.1 mag earthquake (38.253°N, 141.640°E, depth = 49 km (30.4 miles)) of April 7 was in the vicinity, but not the same location as the mag 9 earthquake (38.322°N, 142.369°E, epicenter depth = 32 km (19.9 miles)) of March 11.

Look for the 5 pointed star (it's orange, but should be yellow) in:
http://neic.usgs.gov/neis/eq_depot/2011/eq_110407_c0002ksa/neic_c0002ksa_h.html

Look at the Seismicity profile and see the importance of location, orientation and depth.
http://earthquake.usgs.gov/earthquakes/eqinthenews/2011/usc0001xgp/neic_c0001xgp_c.php
http://earthquake.usgs.gov/earthquakes/eqarchives/subduction_zone/usc0001xgp/

http://neic.usgs.gov/neis/eq_depot/2011/eq_110311_c0001xgp/neic_c0001xgp_h.html


One can do research here
http://www.ngdc.noaa.gov/hazard/tsu.shtml

http://www.jma.go.jp/en/tsunami/observation_04_20110311181349.html

http://itic.ioc-unesco.org/

http://books.google.com/books?id=kR...ing development of benchmarked models&f=false
 
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1. What is the possible tsunami model for the recent 7.1 aftershock and delayed effect at the same site?

The possible tsunami model for the recent 7.1 aftershock and delayed effect at the same site is known as a doublet earthquake. This occurs when two earthquakes happen in the same location within a short period of time, causing a stronger seismic wave and potentially triggering a tsunami.

2. How does a doublet earthquake differ from a single earthquake?

In a doublet earthquake, two earthquakes occur at the same location, while in a single earthquake, there is only one seismic event. The close proximity and timing of the two earthquakes in a doublet increases the overall strength and impact of the seismic activity.

3. What factors contribute to the delayed effect of a doublet earthquake?

The delayed effect of a doublet earthquake is mainly influenced by the size and depth of the two earthquakes. If the second earthquake is larger or deeper than the first, it can take longer for the delayed effects to be observed. Additionally, the type of fault and the geology of the surrounding area can also play a role in the delayed effects.

4. Can a doublet earthquake always trigger a tsunami?

Not all doublet earthquakes have the potential to trigger a tsunami. The magnitude and location of the earthquakes, as well as the characteristics of the surrounding area, all play a role in whether or not a tsunami is generated. It is important for scientists to closely monitor and analyze these factors in order to accurately predict the potential for a tsunami after a doublet earthquake.

5. How can understanding doublet earthquakes help with tsunami preparedness and warning systems?

Studying and understanding doublet earthquakes can help scientists better predict and prepare for potential tsunamis. By recognizing the patterns and characteristics of doublet earthquakes, warning systems can be improved and communities can be better equipped to respond to and mitigate the impacts of a potential tsunami. Additionally, understanding the delayed effects of doublet earthquakes can help with post-earthquake response and recovery efforts in affected areas.

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