/data/photo/2020/12/25/5fe5e7e407ee5.jpg "The 2004 Aceh Tsunami Viral Called a Conspiracy, Experts Describe 7 Facts")
KOMPAS.com – Later, news emerged saying that the tsunami that crippled Aceh in 2004 was a conspiracy.
Reported Grid’s Digest, Sunday (21/3/2021), this theory has actually emerged since two years ago and is widespread on the Internet.
Originator conspiracy theory that is Jerry D Gray. He wrote with a title Project Seal and spread on the internet.
This information was then uploaded by the Instagram account @knowledgethatyouneed on March 10, 2021.
Also read: Get to know the potential of the megathrust earthquake and tsunami in Indonesia
In the “Project Seal” it is said that the tsunami in Aceh 2004 was a superpower engineering thermonuclear weapon for a specific purpose.
Responding to viral news that says Aceh Tsunami In 2004 as part of a conspiracy, seismologist Daryono revealed 7 facts.
Daryono, who also serves as the Head of the Earthquake and Tsunami Mitigation Division at BMKG, confirmed that there is some very strong scientific evidence that the Aceh Tsunami was triggered by a tectonic earthquake, not triggered by a nuclear explosion as the rumors circulating.
Here are 7 facts about the 2004 Aceh earthquake:
1. Vibration recording data
The recording data of ground vibrations in the seismogram shows that there is a recorded body wave in the form of a P (Pressure) wave which is recorded to arrive earlier than the S (Shear) wave that comes next, which is then followed by a surface wave.
“The appearance of these body wave phases is strong evidence that the earthquake and the Aceh tsunami triggered by tectonic activity, not a nuclear explosion, “said Daryono in a written statement to Kompas.com.
2. The meaning of the appearance of the S wave
The appearance of strong S (Shear) waves on the seismogram indicates that the deformation that occurs in the Indian Ocean west of Aceh is a shearing process that occurs suddenly in the earth’s crust due to rock fractures in the tectonic earthquake process, not due to a nuclear explosion.
3. Seabed deformation
Deformation of the seabed in the Indian Ocean west of Aceh on 26 December 2004 was a tectonic earthquake as evidenced by variations in the initial form of P waves in the form of compression (up) and dilation (down) movements on seismograms recorded at BMKG seismic stations.
“If the source is a nuclear explosion, then all seismogram records at various seismic stations begin with an upward motion (compression) of the P wave,” he explained.
4. Tectonic earthquakes are not sudden
The tectonic earthquake that triggered the 2004 Aceh Tsunami did not occur suddenly, but through the process of an opening earthquake (foreshocks) that had appeared since 2002, when the Simeulue 7.0 Earthquake occurred on November 2, 2002.
Daryono said that since then there had been a series of small earthquakes that continued to occur, which was a preliminary earthquake until the peak occurred an earthquake measuring 9.2 on December 26, 2004 at 08.58.53 WIB.
The phenomenon of preliminary earthquakes (foreshocks) that had occurred 2 years earlier is strong evidence that the 2004 Aceh earthquake was not triggered by a nuclear explosion, but a tectonic earthquake with the type: preliminary earthquake (foreshocks) – main earthquake (mainshock) – aftershocks (aftershocks).
5. Fracture path
The 2004 Aceh earthquake formed a rupture line along the subduction zone (line source) from the west of Aceh in the south to the Andaman-Nicobar Islands in the north for about 1500 km.
This is evidence that tectonic earthquake fractures occurred in the Aceh-Andaman Megathrust segment.
The long fractures that formed along these plate subduction pathways are evidence that the deformation of the seabed was not caused by a nuclear explosion.
“Because if there is a nuclear explosion, the deformation will be formed centrally at one point (point source) and not in the form of a line (line source),” he explained.
6. Many aftershocks
Evidence that the devastating shaking in Aceh 2004 was triggered by a tectonic earthquake is the appearance of a series of massive aftershocks along the Megathrust Andaman-Nicobar route following the main earthquake.
If a tsunami were triggered by a nuclear explosion then no record of very many aftershocks would have occurred more than a year later.
“If the tsunami was triggered by a nuclear explosion, there would be no record of the aftershocks for a very long period,” he said.
Also read: Luhut mentioned in his meeting, What is a Megathrust Earthquake?
7. Changes in magnitude data are commonplace
Regarding the changes in the magnitude and epicenter position of the 2004 Aceh earthquake, it is common in the analysis to determine earthquake parameters.
“Changes in earthquake parameters occurred due to data updating due to increased seismic data that was entered and used for analysis by officers at the earthquake monitoring agency,” said Daryono.
The more earthquake data is used, the more stable and accurate the earthquake parameter results will be until the final results are obtained.
Likewise, changes in the epicenter of the earthquake in Aceh in 2006, caused by the fracture process in West Sumatra earthquake occurs gradually and in a region extending from western Aceh to Andaman and Nicobar Islands in India.
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