Analysis Tsunami Waves of Lampung & Banten Tsunami, 24 December 2018.
by : Harlin Pasili Ansori ST. MT.
Based from 4 model that presented by Dr. Mirzam Abdurahman from ITB Volcanologist link :
https://www.itb.ac.id/news/read/56935/home/empat-kemungkinan-terjadinya-tsunami-di-selat-sunda-menurut-volkanolog-itb
in myfacebook post , that they can occuring mecanical impact which the result is tsunami wave.
In the case of Lampung Banten Tsunami probably joint factors between
a. volcanogenic factors.
b. gravity anomaly because moon position effects the sea water.
c. and for some gulf area with certain mecanism such as additional mud slide because the impact wave to the resistance land in sharp gulf , and it will add some additional height to the wave.
Probably there are other factors, if additional research are done to be finished to collect other data beside
a. the volcanic activity of krakatoa data from
Central of Volcanology and mitigation Of geologic disaster of Indonesia (PVMBG Kemen ESDM Indonesia).
b. the data about gravity anomaly because moon position in its revolution in the area closer to earth which effecting the height of Sea Waves in Indonesia from BMKG Indonesia or Institute of Meteorology, Climatology and Geophysic of Indonesia.
But It's clear from two data :
The Mechanical kinetic Energy from wether eruption or slide of volcanic material because volcanology, plus mechanical kinetik energy because gravitational acceleration, made suddenly impact to the sea water and resulting rereaction from sea water in the form of high wave (Second Newton Law) and those volcanogenic process appeared in the same time with the gravity anomaly which impact the height of the waves because of moon position factor, will causing large uprising of the height of sea water waves amplitudo (in simple word : increasing the height of the waves).
And Ofcourse if there is additional mud&sand slide of the beach from sharp gulf formation of beach, that are impacted by tsunami sea wave, this volume of mud & sand slide because the form of sharp beach plus the resultant of the wave of sea water to the tiny gulf formation, both will probably add sone aditional height to the sea waves and increasing the height of tsunami.
That's all my opinion from my fast analysis about the case according the reportation of the two data of Volcanogenic & Gravity Anomaly because The Moon Position.
Indonesia Version :
Dari 4 model yg dibawa Dr. Mirzam Abdurahman dari Volcanologist ITB, menimbulkan impact benturan mekanis yg memicu suatu gelombang tsunami.
Bisa jadi Faktor Gabungan antara longsoran vulkanik maupun letusan vulkanik, yang bergabung dng gelombang pasang anomali gravitasi bulan akibat pd area jalur revolusi mendekat bumi , dan bisa di tambah bagian area tertentu yg lebih tinggi akibat bentuk ceruk/teluk.
Mungkin ada penyebab lain kalau ada data tambahan. Yang jelas kedua faktor itu baik energi mekanis longsoran masive akibat vulkanis maupun hentakan energi mekanis dari volume letusan vulkanis, di tambah energi mekanis tambahan dari percepatan gravitasi , yg kemudian menumbuk air laut yg menimbulkan reaksi gelombang naik di sertai munculnya kenaikan gelombang pasang akibat gravitasi bulan akibat jarak bulan terdekat terhadap air lautan, hal ini dapat saling meningkatkan Amplikasi Ketinggian gelombang yg menimbulkan gelombang pasang.
dan bilamana ada bentuk ceruk/teluk runcing, Plus pada bagian ceruk/teluk yg runcing dapat menambah lagi ketinggian bila ada longsoran ikutan di hulu teluk, yg tentunya menambah tinggi gelombang.
Begitu pendapat saya.
