Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Oguz Ozel is active.

Publication


Featured researches published by Oguz Ozel.


Bulletin of the Seismological Society of America | 2002

Site Effects in Avcilar, West of Istanbul, Turkey, from Strong- and Weak-Motion Data

Oguz Ozel; Edward Cranswick; Mark Meremonte; Mustafa Erdik; Erdal Safak

Approximately 1000 people were killed in the collapse of buildings in Istanbul, Turkey, during the 17 August 1999 Izmit earthquake, whose epicenter was roughly 90 km east of the city. Most of the fatalities and damage occurred in the suburb of Avcilar that is 20 km further west of the epicenter than the city proper. To investigate this pattern of damage, the U.S. Geological Survey, in cooperation with the Kandilli Observatory & Earthquake Research Institute (KOERI), deployed portable digital seismographs at seven free-field sites in western Istanbul, to record aftershocks during the period from 24 August to 2 September. The primary objective of this deployment was to study the site effects by comparing the aftershock ground motions recorded at sites inside and outside the damaged area, and to correlate site effects with the distribution of the damaged buildings. In addition to using weak-motion data, mainshock and aftershock acceleration records from the KOERI permanent strong-motion array were also used in estimating the site effects. Site effects were estimated using S waves from both types of records. For the weak-motion data set, 22 events were selected according to the criteria of signal-to-noise ratio (S/N ratio) and the number of stations recording the same event. The magnitudes of these events ranged from 3.0 to 5.2. The acceleration data set consisted of 12 events with magnitudes ranging from 4.3 to 5.8 and included two mainshock events. Results show that the amplifying frequency band is, in general, less than 4 Hz, and the physical properties of the geologic materials are capable of amplifying the motions by a factor of 5-10. In this frequency band, there is a good agreement among the spectral ratios obtained from the two mainshocks and their aftershocks. The damage pattern for the 17 August Izmit earthquake is determined by several factors. However, our study suggests that the site effects in Avcilar played an important role in contributing to the damage. Manuscript received 30 August 2000.


Journal of Earth System Science | 2014

Liquefaction-induced settlement, site effects and damage in the vicinity of Yalova City during the 1999 Izmit earthquake, Turkey

Ferhat Ozcep; Savaş Karabulut; Oguz Ozel; Tazegul Ozcep; Nazire Imre; Halil Zarif

Yalova City (Turkey) is in a tectonically active location that is particularly affected by the northern branch of the North Anatolian Fault Zone. Magnitudes 7.4 and 7.2 earthquakes in 1999 caused great destruction in Yalova. The heavy damage to buildings and other civil engineering structures was mainly due to liquefaction-induced settlement and site effects such as resonance and amplification. In the first phase of this study, the soil liquefaction potential index (PL) and the induced soil settlement were estimated. In the second phase, the effects on sites in Yalova soil were investigated using microtremor and earthquake data. The fundamental periods and amplification in soft soil were compared with microtremor data and strong ground motion records obtained by a local array of eight accelerograph stations deployed in Yalova. Thirty-seven ‘single site’ ambient noise measurements were taken in a dense grid of points covering the centre of the city. A comparison between fundamental periods obtained from strong ground motion records and from microtremor measurements showed similarities, in the 0.1–5 Hz range. Finally, soil liquefaction and amplification (or resonance) were divided into regions according to the extent of damage and the geotechnical/geophysical results.


Seismological Research Letters | 2009

The Self-Organizing Seismic Early Warning Information Network (SOSEWIN)

Kevin Fleming; Matteo Picozzi; C. Milkereit; F. Kühnlenz; Björn Lichtblau; Joachim Fischer; Can Zulfikar; Oguz Ozel


Geophysical Research Letters | 2009

A study on warning algorithms for Istanbul earthquake early warning system

Hakan Alcik; Oguz Ozel; Nurdan Apaydin; Mustafa Erdik


Soil Dynamics and Earthquake Engineering | 2009

Site characterization by seismic noise in Istanbul, Turkey

Matteo Picozzi; A. Strollo; Stefano Parolai; Eser Durukal; Oguz Ozel; Savaş Karabulut; Jochen Zschau; Mustafa Erdik


Bulletin of Earthquake Engineering | 2010

Wireless technologies for the monitoring of strategic civil infrastructures: an ambient vibration test on the Fatih Sultan Mehmet Suspension Bridge in Istanbul, Turkey

Matteo Picozzi; C. Milkereit; Can Zulfikar; Kevin Fleming; Rocco Ditommaso; Mustafa Erdik; Jochen Zschau; Joachim Fischer; Erdal Şafak; Oguz Ozel; N. Apaydin


Earthquake Spectra | 2000

Recorded Main Shock and Aftershock Motions

Erdal Safak; Mustafa Erdik; Kemal Beyen; David Carver; Edward Cranswick; Mehmet Çelebi; Eser Durukal; William L. Ellsworth; Thomas L. Holzer; Mark Meremonte; Charles S. Mueller; Oguz Ozel; Selcuk Toprak


Soil Dynamics and Earthquake Engineering | 2011

An alternative approach for the Istanbul earthquake early warning system

Hakan Alcik; Oguz Ozel; Yih-Min Wu; Nurcan Meral Ozel; Mustafa Erdik


International Journal for Housing Science and Its Applications | 2000

Earthquake Damage, Site Response, and Building Response in Avcilar, West of Istanbul, Turkey

Edward Cranswick; Oguz Ozel; Mark Meremonte; Mustafa Erdik; Erdal Safak; Charles S. Mueller; Dee Overturf; Arthur D. Frankel


Journal of Applied Geophysics | 2016

Near-surface geophysical methods for investigating the Buyukcekmece landslide in Istanbul, Turkey

Esref Yalcinkaya; Hakan Alp; Oguz Ozel; Ethem Görgün; Salvatore Martino; Luca Lenti; Celine Bourdeau; Pascal Bigarre; Stella Coccia

Collaboration


Dive into the Oguz Ozel's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar

Hiroaki Yamanaka

Tokyo Institute of Technology

View shared research outputs
Top Co-Authors

Avatar

Kosuke Chimoto

Tokyo Institute of Technology

View shared research outputs
Top Co-Authors

Avatar

Seckin Citak

Japan Agency for Marine-Earth Science and Technology

View shared research outputs
Top Co-Authors

Avatar

Ozlem Karagoz

Çanakkale Onsekiz Mart University

View shared research outputs
Top Co-Authors

Avatar

Matteo Picozzi

University of Naples Federico II

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge