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DERİN VE BÜYÜK DEPREMLERİN KAYNAK MEKANİZMALARININ İNCELENMESİ

INVESTIGATION OF SOURCE RUPTURE PROCESS OF DEEP AND LARGE EARTHQUAKES

Journal Name:

  • İstanbul Yerbilimleri Dergisi

Publication Year:

  • 2005

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
The studies on deep earthquakes using the seismological methods provides better means for understanding the deeper parts of the Earth as well as their physical properties.In this study, we have investigated the source process of deep subduction region earthquakes using teleseismic data and the waveform inversion technique developed by Kikuchi and Kanamori (1991). On 23 August 1995, a deep (h=595 km) and large (Mw=7.1) earthquake occurred in Mariana region. After the main shock, several aftershocks were observed on Mariana subduction zone. The deep earthquakes show some similarities with the shallow events, they show some specific differences, as well. Usually, the aftershock activity is low, but in some cases such as the 1995 Mariana earthquake the aftershock activity could be high. On 20 August 1998, an earthquake occurred in Bonin slab (Mw=7.1, h= 400 km). Izu - Bonin subduction zone has been known as seismically very active region in the world. Three subevents were necessary to explain the observed seismic records. The second subevent took place about 20 km to the northwest of the reference point (28.93ºE, 139.33ºN) and the third subevent also took place about 30 km to the northwest of the reference point. The CMT depths of the second and third subevents were found to be 430 and 440 km, respectively.
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Abstract (Original Language): 
Derin depremlerin sismolojik gözlemler ile değerlendirilmesi, yer içi yapısının daha iyi anlaşılmasını ve fiziksel özelliklerinin ortaya çıkarılabilmesini sağlamaktadır. Bu çalışmada, tele – sismik cisim dalgaları kullanılarak, Kikuchi ve Kanamori (1991) tarafından geliştirilen dalga şekli ters çözüm yöntemi kullanılarak dalma-batma bölgelerindeki derin depremlerin kaynak mekanizma özellikleri araştırılmıştır. 23 Ağustos 1995’de Mariana bölgesinde Mw=7.1 büyüklüğünde, odak derinliği 595 km olan bir deprem meydana gelmiştir. Ana şoktan sonra, bölgede artçı şok etkinliği yoğun bir şekilde gözlenmiştir. Ters çözüm çalışmaları sonucu, Mariana depreminin tek şoktan meydana geldiği ve ana şok sonrası artçı şok etkinliği ile dalan levhada enerji boşalımı devam ettiği anlaşılmıştır. Mariana dalma–batma bölgesi soğuk yada eski dalan levha olarak adlandırılmaktadır. Genellikle dalma – batma bölgelerinde artçı şok etkinliği çok düşük olmakla birlikte bazı depremlerde, 1995 Mariana gibi, yüksek artçı şok etkinliği gözlenebilmektedir. 20 Ağustos 1998 yılında Izu – Bonin bölgesinde derin (h=440) ve büyük (Mw=7.1) bir deprem meydana gelmiştir. Bonin dalma – batma bölgesi, yüksek sismik etkinliğe sahip bir bölgedir. Bu çalışmada, 1998 Bonin depreminin ters çözüm sonucu üç alt olaydan meydana geldiği bulunmuştur. Birinci alt olay referans noktasında, ikinci alt olay, referans noktasından (28.93ºE, 139.33ºN) yaklaşık 20 km kuzey batıda ve 430 km derinliğinde; üçüncü alt olay da referans noktasından yaklaşık 30 km kuzey batıda, 440 km derinliğinde meydana gelmiştir.
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  • Turkish

REFERENCES

References: 

Antolik, M., D. Dreger And B. Romanowicz, 1999,
Rupture processes of large deep-focus earthquakes
from inversion of moment rate functions, J. of
Geophys. Res., Vol. 104, No. B1, pp. 863-894.
Collier, D. J., G. R. Helffrich And B. J. Wood, 2001,
Seismic discontinuities and subduction zones,
Physics of the Earth Planetary Interiors, 127, 35-49.
Frohlich, C., 1989, The nature of deep focus
earthquakes. Ann. Rev. Earth Planet. Sci. 17, 227 –
254.
Isacks, B., J. Oliver And L.R. Sykes, 1968,
Seismology and new global tectonics, J. Geophys.
Res., 73, 5855-5899.
Isacks, B. And P. Molnar, 1971, Distribution of
stresses in the descending lithosphere from global
survey of focal mechanizm solution of mantle
earthquake, Rev. Geophys. And Space Phys., 9, 103-
174.
Jeffreys, H. And K. E. Bullen, 1958, Seismological
Tables, Office of the British Association, Burlington
House, London.
Kanamori, H., 1971, Great earthquakes at island arcs
and the lithosphere, Tectonophysics, 12, 187 – 198.
Kelleher, J., J. Savıno, H. Rowlett And W. Mccann,
1974, Why and Where great thrust earthquakes
occur along islands arcs, J. Geophys. Res.,79, 4889
– 4919.
Kikuchi, M., And H. Kanamori, 1982, Inversion of
complex body waves Bull. Seis. Soc. Am., 72,491-
506.Kikuchi, M., And Y. Fukao, 1985, Iterative
deconvolution of complex body waves from great
earthquakes – the Tokachi – Oki earthquake of 1968,
Phys. Earth Planet Interiors, Vol. 7, pp. 25-248,
1985.
Kikuchi, M., And H. Kanamori, 1991, Inversion of
complex body waves – III. Bull. Seis. Soc. Am., 81.
2335-2350.
Kikuchi, M., H. Kanamori And K. Satake, 1993,
Source complexity of the 1988 Armenian
earthquake: evidence for a slow after-slip event, J.
Geophys. Res., Vol. 98, pp. 15,797 - 15,808.
Lay, T., T.C. Wallace, 1995, Modern Global
Seismology, Academic Press, San Diego, ISBN 0-
12-732870-X.
Okal, E. A., 2001, “Detached” deep earthquakes: are
they really?, Physics of the Earth Planetary Interiors,
127, 109-143.
Oliver, J., and B. Isacks, 1967, Deep Earthquake
Zones, Anomalous Structures in the Upper Mantle,
and the Lithosphere, Journal of Geophys. Res.,
Vol.72, No.16.
Özçelik, S., 2004, Derin Depremlerin (400 –670 km)
Oluşum Mekanizmalarının Dalga Şekli Ters Çözüm
Yöntemiyle Araştırılması, Yüksek Lisans Tezi,
İstanbul Üniversitesi Fen Bilimleri Enstitüsü, 2004,
İstanbul.
Page, R., 1968, Focal depths of aftershocks, J.
Geophys. Res. 73, 3897 – 3903.
Pınar, A., 1995, Rupture Process and Spectra of Some
Major Turkish Earthquakes and Their
Seismotectonic Implications, Bogazici University,
Istanbul.
Pınar, A., 1998, Source inversion of the
October1,1995,Dinar earthquake (Ms=6.1):a rupture
model with implications for seismotectonics in SW
Turkey, Tectonophysics 292, 255-266.
Tibi, R.,G. Guenter And D.A. Wiens, 2003, Source
characteristics of large deep earthquakes: Constraint
on the faulting mechanism at great depths, J.
Geophys. Res., Vol. 108, NO. B2, 2091.
Toksöz, M.N., J.W. Minear And B.R. Julian, 1971,
Temperature field and geophysical effects of a down
going slab, J. Geophy. Res., 76, 1113-1138.
Widiyantoro, S., B. L. N. Kennett And R. D. Van Der
Hilst, 1999, Seismic tomography with P and S data
reveals lateral variations in the rigidity of deep slabs.
Earth Planet. Sci. Lett. 173, 91–100.
Wiens, D.A. And H. J. Gilbert, 1996, Effect of slab
temperature on deep-earthquake aftershock
productivity and magnitude-frequency relations,
Nature, 384, 153 – 156.
Wiens, D. A., J. Hildebrand, And W. Crawford,
1996, Source and aftershock studies of the 1995
Marianas and 1996 Flores Sea deep earthquakes,
Eos Trans. AGU, 77(46), Fall. Meet. Suppl., F491-
F492.
Wiens, D. A., 2001, Seismological constraints on the
mechanism of deep earthquakes: temperature
dependence of deep earthquake source properties,
Physics of the Earth and Planetary Interiors, 127,
145 – 163.
Wu, L. R. And W. P. Chen, 1999, Anomalous
aftershocks of deep earthquakes in Mariana,
Geophys. Res. Lett., Vol. 26, No. 13, pp. 1977-
1980.

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