Rapid magnitude determination for earthquake early warning
Richard M Allen University of Wisconsin-Madison
Email: email@example.com Tel: +1 608 262 7513 Fax: +1 608 262 0693
in "The Many Facets of Seismic Risk" edited by G. Manfredi, M.R. Pecce, and A. Zollo, Universita
degli Studi di Napoli "Federico II", Napoli, Italy, p15-24, 2004.
This is the proceedings of the "Workshop on Multidisciplinary Approach to Seismic Risk Problems,"
Sant'Angelo dei Lombardi, September 22, 2003.
The goal of an earthquake early warning system is to provide notification of ground shaking hazard
before significant ground motion is felt. An operational system requires four components: (1) seismic
network infrastructure, (2) rapid event characterization, (3) spatial hazard prediction, and (4) a
notification system to warn of hazard. Here I present an overview of such an early warning system
designed for use with a dense seismic network in the earthquake source region. Emphasis is placed on
components (2) and (3) as they are common to implementation of the system in any region. The
particular example described is for southern California; however, the same methodology could be
utilized in the Irpinia region of Italy.
In many earthquake prone regions, including California, Japan, Taiwan, Italy, and Turkey, population
centers are collocated with the earthquake source region. In such a case, hazard must be determined
using the low amplitude P-wave which can be detected seconds before significant ground motion