Magnitude determination using strong ground-motion attenuation in earthquake early warning
Resource
Geophysical Research Letters, 37, L07304
Journal
Geophysical Research Letters
Journal Volume
37
Journal Issue
7
Pages
n/a--n/a
Date Issued
2010-04
Author(s)
Ting-Li Lin
Abstract
We use 1661 strong‐motion accelerograms with peak ground acceleration (PGA) larger than 80 Gal (1 Gal = 1.0 cm/s 2 ) from 77 earthquakes recorded by the Taiwan Strong Motion Instrumentation Program (TSMIP) stations to derive a strong‐motion attenuation relationship. This relationship can be used to dynamically define a “ M pga magnitude” for earthquakes using earthquake locations determined by earthquake early warning process. The M pga magnitude using this strong‐motion attenuation relationship corresponds well with M w given a sufficient number of PGA readings. MEMS (Micro Electro Mechanical Systems) acceleration sensor could be widely used for ground motion monitoring purposes. Thus, we propose that once a large earthquake has begun, that we might be able to use strong, near‐field (tens of kilometers) PGA values to quickly estimate the earthquake's magnitude, which would improve earthquake early warning.
Type
journal article