The Nepal government science and technology body, Nepal Academy of Science and Technology (NAST) has installed an early warning system in its Khumaltar office. According to reports, the early warning system can inform the earthquake in 10-22 seconds in advance. The system relies on the travel of different types of earthquake waves.
During earthquake two types of waves namely, P-wave and S-wave, are generated. While P-waves travel fast and are less damaging to structures, S-waves are more devastating. The warning system picks up P-waves and warn in advance about the upcoming damaging S-wave.
Earthquake sensors for early warning system are installed in different parts of the country to sense the the P-wave and sent it to the central system for early warning for the upcoming strong tremors. In addition to warning, the P-waves can also give information about the magnitude and location of earthquake. For the smooth operation of the equipment, un-interrupted electricity and internet is required.
The equipment, brought in grant assistance of China, will initially have 80 sensor. According to the Vice Chancellor of NAST, Dr. Jeev Raj Pokharel, 320 sensors are required to cover the entire country. Such early warning systems are deployed in countries like Mexico, Japan, United States and China.
The earthquake of April 25, 2015 in Nepal had killed almost nine thousand people and damaged a large number of structures. The earthquake is told to have moved the Mt. Everest by about three centimeters in south-west direction, according to Chinese authorities.