Ten years have passed since the deadly tsunami disaster in Aceh on December 26, 2004. How heartbreaking incident when it teach you about the earthquake and tsunami preparedness?
The moment a decade tsunami on Friday (12/26/2014) Today is the right time to increase knowledge on two geological disasters, it is time to correct some of the thinking that is not quite right about it. Anything?
The quake was felt hard not cause a tsunami
Wrong. The quake was felt hard not necessarily not cause a tsunami. Conversely, not necessarily also feels hard earthquake certainly cause a tsunami.
For example, the earthquake in Simeulue, Aceh, on April 15, 2012. An earthquake with a magnitude twins occur quite large, 8.5 and 8.1. However, a small tsunami generated.
Revealed, the earthquake was not sourced from the subduction zone (meeting plate). The quake was also shallow and more oblique fracture movement mechanism.
Meanwhile, examples of the earthquake that was felt hard but cause a tsunami was Pangandaran earthquake in 2006 and the Mentawai earthquake in 2010.
Tectonic experts from the Institute of Technology Bandung (ITB), Irwan Meilano, revealed that the earthquake in Pangandaran and Mentawai including "tsunami earthquake" or "slow earthquakes".
"Tsunami earthquake" occurs when a shallow earthquake center, adjacent to the trough, and close to the mainland.
Region in the zone usually has a high rigidity and rich sediments. Did not feel the earthquake but it can be high tsunami.
Early warning instrument is very important to know the "tsunami earthquakes". This earthquake is difficult to guess just by sense.
Only the Indonesian islands of the Pacific and Indian Facing the tsunami-prone
Indeed, the islands are not facing directly into the Pacific and the Indian had a lower risk affected by the tsunami. However, it is not entirely true.
Irwan study found that activity in subduction zones in the western part of Sulawesi never produced a tsunami that reached the area of Balikpapan, East Kalimantan.
Mr. Widjo Kongko Predictions experts, with a magnitude 8.1 earthquake, North Sulawesi, Maluku, and the surrounding potentially hit by the tsunami with a height of 5 meters.
Borneo earthquake and tsunami risk free
Wrong. Has not been much research on the potential earthquake in Borneo so unclear also whether the island is free from the threat of earthquakes.
One also said that the province is free from the threat of a tsunami. Study researchers tsunami Agency for the Assessment and Application of Technology (BPPT), Mr. Widjo Kongko, show it.
Mr. Widjo said, according to a study in 2010, double subduction activity between North Sulawesi and Maluku potential magnitude 8.1 earthquake.
The earthquake was predicted to cause a tsunami. Not only Sulawesi and Maluku who will be affected, but also Borneo.
Kalimantan are potentially affected by the tsunami, among others, the East Kutai, Berau, Nunukan and Bulungan.
Medium-scale tsunami could hit 2-2.5 hours after the earthquake. Height of 0.5 to 1 meter in shallow waters and reach 2 times as much on the beach.
Severe effects of the tsunami could remember the coastal region of Borneo is the lifeblood of the economy. In addition, preparedness is still minimal.
Of the 4,500 km long coast tsunami hazard only 38 sirens tsunami of 1000 siren needs. Evacuation Shelter there are only 50 units from 2,500 units needs.
Double subduction between North Sulawesi and Maluku itself has high seismic activity. In the span of 1600 - 2007, there were 2,800 earthquakes and 10 tsunami.
Distance tsunami next one and certainly hundreds of years
Not exactly. Tsunami are sourced from the same subduction possible within hundreds of years. However, it could be a city affected by the tsunami many times in a matter of years.
The city of Sendai in Japan several times affected by the tsunami in the short time lag. Resulting tsunami earthquake source is different.
Western region of Sumatra has many sources of seismic sea. Thus, a town in the region affected by the tsunami could also many times.
Although a large tsunami affected Aceh ever in 2004, does not mean that the new city of Mecca could porch tsunami affected hundreds of years later.
Aceh together Padang and Mentawai tsunami could have been affected by the earthquake from different sources. So, should remain vigilant.
Sea dike can certainly protect themselves from the tsunami
Wrong. In general, it can be said. But, as well as technology in general, there remains a limitation.
Sea dike has limitations on height and strength. When the tsunami wave height is low, it can protect the sea dike.
Case 9 magnitude earthquake on March 11, 2011 in Japan is evidence that sea dike can not protect 100 percent. Wave height is higher than the sea dike.
This is the importance of spatial planning and choosing residential area relatively far from the sea.
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