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By coincidence, in the same week (beginning November 2007) Bangkok was featured in two different news media. One article in the Bangkok Post stated that Bangkok was at risk if earth quakes occurred several hundred kilometers away from the city. CNN and other Media on the other hand, reported that Bangkok was at risk from rising sea levels, and sinking land levels.
Earth Quake
( Bangkok Post 2 November 2007 )
A few years back way after midnight, we were walking round in our apartment, when we got the distinct impression that the whole building was swaying for 15 seconds or so. Honestly, we did not think too much of it. The next day it appeared that an earth quake had occurred many hundreds of kilometers away in Myanmar, with some minor damage to buildings in Bangkok (some cracks in the walls at well known locations). Some of the Japanese in our building had come down during the night in some minor panick. They seemed to have judged correctly what was going on.
A seminar on
earthquake-resistant buildings was held in Bangkok at the end of October. Apparently 12
provinces in Thailand were added to the quake-risk area. They include Bangkok, some provinces in the central plains and the south of Thailand. Then provinces, mainly in the north of the country, were already on the list because of their proximity to active fault lines (including Chiang Mai).
Apparently at present, owners of tall and public buildings, including entertainment venues, warehouses, and hospitals in risk areas are required to design and use materials that can withstand earthquakes. This may add up to 10% to the costs of new buildings. This also means that most buildings in Bangkok at present most likely are at some risks from earthquakes. Bangkok is at risk from two fault lines, one located in Myanmar about 400 km away, one located in Kanchanaburi province about 200 km away. A lot of buildings in Bangkok seem to be located on 'soft clay'. They could be damaged when an important earthquake occurs at the fault lines. A comparison was made with Mexico City (also on soft clay) that suffered damage from an earthquake 400 km away in 1985. More than 9,000 people were killed and more than 400 buildings destroyed in Mexico at the time.
Sinking Land and Rising Sea Levels
( Reported by various Media, October 2007 )
The Bangkok Metropolis rests at an altitude of 1-2 meters above sea level with some parts of the city already below sea level. Because of its location on soft clay, the city apparently is sinking at a rate of about 4 inches per year. Bangkok was founded 225 years ago on a swampy
floodplain along the Chao Phraya River. Beginning in the 1950's a lot of its canals were filled to make way for roads, impairing the natural drainage system. It is conceived that within 15-20 years the whole area may be located below sea level. It is not quite an option to move the whole city away from its present location, so a lot of effort will have to be made protecting Bangkok from being submerged by the sea. Options are : high dikes on both banks of the Chao Phraya River, forking to
the right and left at the mouth of the river ; diversion water channels ; more upcountry located dams ; diverting water into reservoirs (the Monkey Cheeks, an idea of Thailand's King).
Besides the sinking of the city, one has to take also into account the possibility of rising sea levels due to global warming. At present this is a slow process, with the waters in the Gulf of Thailand rising at a rate of 1/10 inch each year.
In any case, this is something more to think about when you consider buying property in Bangkok.
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