Lg Coda Variations in North-Central Iran
Ground motion records in north-central Iran have been used in order to obtain the Lg coda 𝑄, using stack spectral ratio method. The lateral variations in 𝑄0 and its frequency dependence are estimated in the 0.3–7.0 Hz frequency range which led to 𝑄=267(±32)×𝑓0.71(±0.14). The observed variations in q...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2012/673506 |
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| author | Mojtaba Naghavi Zaher Hossein Shomali Mehdi Zare |
| author_facet | Mojtaba Naghavi Zaher Hossein Shomali Mehdi Zare |
| author_sort | Mojtaba Naghavi |
| collection | DOAJ |
| description | Ground motion records in north-central Iran have been used in order to obtain the Lg coda 𝑄, using stack spectral ratio method. The lateral variations in 𝑄0 and its frequency dependence are estimated in the 0.3–7.0 Hz frequency range which led to 𝑄=267(±32)×𝑓0.71(±0.14). The observed variations in quality factor show low values of 𝑄0 in western part of the study region where bounded by relatively high values in southern and northern parts. Since the seismicity of the study area is quite shallow the obtained results can be attributed to the upper 30 km of the crust. The Damavand volcano and its surrounding region also exhibit variations in the value of 𝑄0 which result in low and intermediate values of 𝑄0 in western and eastern parts, respectively. Current seismicity in Damavand is mostly confined to its southwestern part, whereas our results proved to possess low values of 𝑄0. In general, most of 𝑄 factor variations can be attributed to the lateral heterogeneity as well as the severity of the crustal velocity gradient, and as expected the north-central Iran is well inferred as a tectonically active region. |
| format | Article |
| id | doaj-art-a016731777e74675bdb6d4583af44f88 |
| institution | Kabale University |
| issn | 1687-885X 1687-8868 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Geophysics |
| spelling | doaj-art-a016731777e74675bdb6d4583af44f882025-02-03T01:10:42ZengWileyInternational Journal of Geophysics1687-885X1687-88682012-01-01201210.1155/2012/673506673506Lg Coda Variations in North-Central IranMojtaba Naghavi0Zaher Hossein Shomali1Mehdi Zare2Institute of Geophysics, University of Tehran, Tehran, 14155-6466, IranInstitute of Geophysics, University of Tehran, Tehran, 14155-6466, IranInternational Institute of Earthquake Engineering and Seismology (IIEES), Tehran, 19395-3913, IranGround motion records in north-central Iran have been used in order to obtain the Lg coda 𝑄, using stack spectral ratio method. The lateral variations in 𝑄0 and its frequency dependence are estimated in the 0.3–7.0 Hz frequency range which led to 𝑄=267(±32)×𝑓0.71(±0.14). The observed variations in quality factor show low values of 𝑄0 in western part of the study region where bounded by relatively high values in southern and northern parts. Since the seismicity of the study area is quite shallow the obtained results can be attributed to the upper 30 km of the crust. The Damavand volcano and its surrounding region also exhibit variations in the value of 𝑄0 which result in low and intermediate values of 𝑄0 in western and eastern parts, respectively. Current seismicity in Damavand is mostly confined to its southwestern part, whereas our results proved to possess low values of 𝑄0. In general, most of 𝑄 factor variations can be attributed to the lateral heterogeneity as well as the severity of the crustal velocity gradient, and as expected the north-central Iran is well inferred as a tectonically active region.http://dx.doi.org/10.1155/2012/673506 |
| spellingShingle | Mojtaba Naghavi Zaher Hossein Shomali Mehdi Zare Lg Coda Variations in North-Central Iran International Journal of Geophysics |
| title | Lg Coda Variations in North-Central Iran |
| title_full | Lg Coda Variations in North-Central Iran |
| title_fullStr | Lg Coda Variations in North-Central Iran |
| title_full_unstemmed | Lg Coda Variations in North-Central Iran |
| title_short | Lg Coda Variations in North-Central Iran |
| title_sort | lg coda variations in north central iran |
| url | http://dx.doi.org/10.1155/2012/673506 |
| work_keys_str_mv | AT mojtabanaghavi lgcodavariationsinnorthcentraliran AT zaherhosseinshomali lgcodavariationsinnorthcentraliran AT mehdizare lgcodavariationsinnorthcentraliran |