NEW YORK – Natural disasters that were in Indonesia long before the Sunda Strait tsunami (12/22/2018) have been investigated by NASA and other space agencies. NASA make sure the tsunami waves in Indonesia are not just vertical waves but horizontal. An earthquake measuring 7.5 on the Richter Scale, followed by a tsunami that hit Indonesia, claimed Soul casualties up to 1,300.
Even from this NASA study, it produced a challenging theory that tsunamis only get a boost of energy from a large part of the vertical movement of the seabed.
This is not the first time that an earthquake caused mass damage and death in Indonesia. Especially with the tsunami. But why? The answer is a combination of the presence of tectonic plates in the region, the shape of the coastline, vulnerable communities and poor prime warning systems. All these things have a role that makes the tsunami in Indonesia very dangerous.
But in 2007, Tony Song, an oceanographer at NASA’s Jet Propulsion Laboratory in Pasadena, California, agreed to the theory after analyzing the 2004 Aceh earthquake and tsunami that was strong in the Indian Ocean.
From the results of the study, seismograph and GPS data showed that the vertical lifting of the seabed wave would produce enough energy to create a high tsunami.
But Song and his colleagues’ formulations show that the energy from the horizontal movement of the seafloor is also taken into account, because it gives a fast and strong wave boost.
The results matched the tsunami data collected from the satellite trio – NASA / National Center d’Etudes Spatiales (CNES) Jason, Geosat US Navy Follow-on and the European Space Agency’s Environmental Satellite.
“I began to consider that the two misrepresentations were responsible for the long-accepted but misleading conclusions that horizontal movements only produce a little kinetic energy,” Song said.
Even a new experiment illustrates that horizontal seabed displacement accounts for more than half of the energy produced by the 2004 and 2011 tsunamis.
“From this study, we have shown that we need to see not only vertical movements but also the sea floor to get the total energy transferred to the sea and predict tsunamis,” said Solomon Yim, a civil professor.
This finding further validates the approach developed by Song and his colleagues who used GPS technology to detect tsunami size and strength for early warning.