DETERMINATION OF THE ATTENUATION MODEL FROM LOCAL AND REGIONAL EARTHQUAKES IN ALBANIA

DUSHI, EDMOND; LAME (MUDA), VALBONA

AKTET - Journal of Institute Alb-Shkenca
AKTET, Volume 4, Issue 2, Gjeologji, Metalurgji, Inxhinieri Kimike, Riciklim, 2011

Title: DETERMINATION OF THE ATTENUATION MODEL FROM LOCAL AND REGIONAL EARTHQUAKES IN ALBANIA

Titulli shqip: PëRCAKTIMI I MODELIT Të SHUARJES NGA TëRMETET LOKAL DHE RAJONAL Në SHQIPERI

Abstract: Local and regional seismicity in Albania is monitored through broad band instrumentation. The lack of a frequency dependent attenuation function for Albania leaded to efforts towards the determination of an adequate model based on BB data and well known spectral techniques. In this study, Coda (Q) method is applied using Coda-Q program, as part of Seisan ver. 8.1.2 seismic analysis system. Attenuation model of the form Q(f)=Q_0 f^α is achieved where Q0 = 81 (±σ = 8), α = 0.84 (±σ = 0.08). For a better determination of the vertical gradient, different lapse times are taken into account. Using this model a better constrains of spectral source parameters (earthquakes), will achieve in the future.

Abstrakti: Sizmiciteti lokal dhe ai rajonal ne Shqiperi monitorohet instrumentimit me bande te gjere. Mungesa e nje funksioni frekuencial te shuarjes per Shqiperine çoi ne perpjekjen per te percaktuar nje model te pershtatshem bazuar ne te dhenat BB dhe teknikat e mirenjohura spektrale. Ne kete studim, u aplikua metoda Coda(Q) duke perdorur programin Coda-Q, si pjese e Sistemit Analizues Sizmik Seisan ver. 8.2.1. U perftua modeli i shuarjes ne trajten Q(f)=Q_0 f^α ku Q0 = 81 (±σ = 8), α = 0.84 (±σ = 0.08). Per nje percaktim me te mire te gradientit vertikal jane marre ne konsiderat intervale te ndryshme te koheshtrirjes se sinjalit. Duke perdorur kete model ne te ardhmen, mund te percaktohen me saktesi te kenaqeshme parametrat spektral per burimet sizmike (termetet).

Key words: coda wave, lapse time, quality factor, attenuation

Fjalë kyçe: valet koda, kohështrirja, faktori cilësor, shuarja

Corresponding author: EDMOND DUSHI (e.dushi@geo.edu.al)

Authors: EDMOND DUSHI, Instituti i Gjeoshkencave, Tiranë, Albania
VALBONA LAME (MUDA), Universiteti Politeknik i Tiranes, Fakulteti i Inxhinierise Matematike dhe Fizike, Tiranë, Albania

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	AKTET Journal of Institute Alb-Shkenca Revistë Shkencore e Institutit Alb-Shkenca ( ISSN 2073-2244 )
(english)

Title:	DETERMINATION OF THE ATTENUATION MODEL FROM LOCAL AND REGIONAL EARTHQUAKES IN ALBANIA
Titulli shqip:	PëRCAKTIMI I MODELIT Të SHUARJES NGA TëRMETET LOKAL DHE RAJONAL Në SHQIPERI
Abstract:	Local and regional seismicity in Albania is monitored through broad band instrumentation. The lack of a frequency dependent attenuation function for Albania leaded to efforts towards the determination of an adequate model based on BB data and well known spectral techniques. In this study, Coda (Q) method is applied using Coda-Q program, as part of Seisan ver. 8.1.2 seismic analysis system. Attenuation model of the form Q(f)=Q_0 f^α is achieved where Q0 = 81 (±σ = 8), α = 0.84 (±σ = 0.08). For a better determination of the vertical gradient, different lapse times are taken into account. Using this model a better constrains of spectral source parameters (earthquakes), will achieve in the future.
Abstrakti:	Sizmiciteti lokal dhe ai rajonal ne Shqiperi monitorohet instrumentimit me bande te gjere. Mungesa e nje funksioni frekuencial te shuarjes per Shqiperine çoi ne perpjekjen per te percaktuar nje model te pershtatshem bazuar ne te dhenat BB dhe teknikat e mirenjohura spektrale. Ne kete studim, u aplikua metoda Coda(Q) duke perdorur programin Coda-Q, si pjese e Sistemit Analizues Sizmik Seisan ver. 8.2.1. U perftua modeli i shuarjes ne trajten Q(f)=Q_0 f^α ku Q0 = 81 (±σ = 8), α = 0.84 (±σ = 0.08). Per nje percaktim me te mire te gradientit vertikal jane marre ne konsiderat intervale te ndryshme te koheshtrirjes se sinjalit. Duke perdorur kete model ne te ardhmen, mund te percaktohen me saktesi te kenaqeshme parametrat spektral per burimet sizmike (termetet).
Key words:	coda wave, lapse time, quality factor, attenuation
Fjalë kyçe:	valet koda, kohështrirja, faktori cilësor, shuarja
Corresponding author:	EDMOND DUSHI (e.dushi@geo.edu.al)
Authors:	EDMOND DUSHI, Instituti i Gjeoshkencave, Tiranë, Albania VALBONA LAME (MUDA), Universiteti Politeknik i Tiranes, Fakulteti i Inxhinierise Matematike dhe Fizike, Tiranë, Albania
Full text:	Download Issue 2 [PDF]