Long Period Seismic Waves Developed at Local Distances

Year 2018, Volume: 4 Issue: 1, 40 - 45, 05.07.2018

Esra Kalkan Ertan , Ali Pınar , Ümit Dikmen

Abstract

Long period seismic waves has two types.
One of them is caused from far-source earthquakes and the other one is caused
from near field type earthquakes. (Koketsu and Miyake, 2008)  Long period seismic waves could be really
destructive since these kind of waves amplify their effect when they are
passing through the sediman areas. There are many examples in literature. A
devastating example is Mexico City, which is located 400 km away from the 1985
Michoacan Earthquake (Mw=8.0) (Celebi et al, 1987). This study’s aim is to
detect the long period seismic waves which will effect Marmara Region and
generate relationship according to path and source.  On May 24, 2014 Mw=6.9 Gökçeada earthquake
was occurred and after this event, there were far source long period ground
waves observed at Marmara Region. We used 5 stations to compare the wave
characteristic. Gökçeada station is the closest station and 40 km away, the
other 4 stations are 300 km away from the epicenter and they are located at
near İstanbul. We observed long period seismic waves at these stations.  For future works, the aim is to make a long
period ground waves map for Marmara Region especially for İstanbul, and
calculate their effect.

Keywords

Long period sesimic waves, near field, far source, Marmara Region

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