|Living with Crisis in the Future|
|There are inherent risks that come with the use and enjoyment of natural resources. Let’s learn how to face natural disasters and coexist with them.|
|Geologically Sensitive Areas|
After Taiwan passed the Geology Act in 2010, and the Ministry of Economic Affairs categorized the geologically sensitive areas into five categories: geologic remains, groundwater recharge areas, active faults, landslide and landslip areas, and other sensitive areas. To this day, Yilan county has announced locations that fall into the three categories: geologic remains (H0010 Guishan Island Volcanic Debris Layers), landslide and landslip areas (L0016 Yilan County), and groundwater recharge areas (G0003 Yilan Plain).
In the offshore east of Taiwan, earthquakes are frequent due to the convergence and collision of the Eurasian Plate and the Philippine Sea Plate. The earthquake epicenter often occurs in Nan’ao, Yilan, and an earthquake can cause geological hazards such as soil liquefaction, landslides, and landslips.
Soil liquefaction is an important issue concerning urban and rural development and disaster prevention. Soil liquefaction-induced disasters include the tilting/collapse of built structures, cracking of land, land subsidence, etc. Underground pipes might be forced to the surface and burst due to liquefaction as well. Areas with high soil liquefaction potential in Yilan have, accounting for 15.45% of the whole county. The primary reason for such a high number is that muddy areas with a high groundwater level are prone to liquefication when an earthquake strikes.
|Landslide and Debris Flow|
Modern landslide monitoring systems emphasize early warnings and disaster prevention. Methods such as aerial photographs, remote sensing images, field investigation, rock core drilling, etc. are used to determine the potential landslide areas and to support disaster prevention efforts.