Tileylioğlu, Salih

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https://hdl.handle.net/20.500.12469/6161
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T.,Salih
Tileylioğlu, SALIH
Tileylioglu,S.
Tileylioglu, Salih
Tileylioglu S.
Salih Tileylioğlu
Tileylioğlu,S.
Tileylioglu,Salih
T., Salih
Tileyoglu S.
SALIH TILEYLIOĞLU
Salih TILEYLIOĞLU
TILEYLIOĞLU, SALIH
Tileylioğlu, S.
Salih, Tileylioglu
Tileylioğlu, Salih
TILEYLIOĞLU, Salih
S. Tileylioğlu
Tileyoğlu, Salih
Tileylioglu, S.
Job Title
Dr. Öğr. Üyesi
Email Address
[email protected]
Main Affiliation
Civil Engineering
Civil Engineering
05. Faculty of Engineering and Natural Sciences
01. Kadir Has University
Status
Current Staff
Website
ORCID ID
0000-0003-3951-7755
Scopus Author ID
23478717400
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33rd Conference on Signal Processing and Communications Applications-SIU-Annual -- Jun 25-28, 2025 -- Istanbul, Turkiye4
2020 28th Signal Processing and Communications Applications Conference, SIU 2020 - Proceedings -- 28th Signal Processing and Communications Applications Conference, SIU 2020 -- 5 October 2020 through 7 October 2020 -- Gaziantep -- 1664131
Bulletin of Earthquake Engineering1
Earth Science Informatics1
World Conference on Earthquake Engineering Proceedings1
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Now showing 1 - 9 of 9
  • Thumbnail Image
    Conference Object
    Representing Earthquake Accelerogram Records for Cnn Utilization;
    (Institute of Electrical and Electronics Engineers Inc., 2020) Cikis,M.; Tileyoglu,S.; Akagunduz,E.
    In this study, a spectrogram based false color representation of earthquake accelergrams is proposed and its usability for both human investigation and its application in convolutional networks are discussed. By using more than forty two thousand earthquake records open to the public, an epicenter clustering algorithm was employed, and it was observed that earthquakes in similar clusters produce similar representations. The prospective purpose of the proposed representation is to estimate the epicenter of an earthquake by processing the accelerograms recorded in a single station using convolutional networks. © 2020 IEEE.
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    Article
    Deep Learning-Based Epicenter Localization Using Single-Station Strong Motion Records
    (Springer, 2025) Turkmen, Melek; Meral, Sanem; Yilmaz, Baris; Cikis, Melis; Akagunduz, Erdem; Tileylioglu, Salih
    This paper explores the application of deep learning (DL) techniques to strong motion records for single-station epicenter localization. Often underutilized in seismology-related studies, strong motion records contain rich information for source parameter inference. We investigate whether DL-based methods can effectively leverage this data for accurate epicenter localization. Our study introduces AFAD-1218, a collection comprising more than 36,000 strong motion records sourced from Turkey. To utilize the strong motion records represented in either the time or the frequency domain, we propose two neural network architectures: deep residual network and temporal convolutional networks. Our findings highlight significant reductions in prediction error achieved through the exclusion of low signal-to-noise ratio records, both in nationwide experiments and regional transfer-learning scenarios. Overall, this research underscores the promise of DL techniques in harnessing strong motion records for improved seismic event characterization and localization. Our codes are available via this repo: https://github.com/melekturkmen/EarthQuakeLocalization
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    Conference Object
    Variational Autoencoders for P-Wave Detection in Strong Motion Earthquake Records
    (IEEE, 2025) Ispak, Turkan Simge; Tileylioglu, Salih; Akagunduz, Erdem
    Earthquake early warning systems rely on accurate detection of Primary waves before the destructive Secondary waves arrive. However, identifying P-wave onsets in strongmotion accelerograms is challenging due to high noise, limited labeled data, and complex waveforms. This paper proposes a Variational Autoencoder framework for self-supervised P-wave detection in strong-motion data. A Convolutional VAE is trained to reconstruct P-wave segments while rejecting noise and non-P-wave inputs. We employ a sliding window method, combining reconstruction loss and normalized cross-correlation, to locate P-wave arrivals. Experimental results on 1, 2, and 3 second segments show robust performance with area-under-the-curve up to 0.97, demonstrating improved accuracy for longer segments and reduced computational cost for shorter segments.
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    Book Part
    Citation - Scopus: 3
    Deep Learning-Based Average Shear Wave Velocity Prediction Using Accelerometer Records
    (International Association for Earthquake Engineering, 2024) Yilmaz, B.; Türkmen, M.; Meral, S.; Akagündüz, E.; Tileylioglu, S.
    Assessing seismic hazards and thereby designing earthquake-resilient structures or evaluating structural damage that has been incurred after an earthquake are important objectives in earthquake engineering. Both tasks require critical evaluation of strong ground motion records, and the knowledge of site conditions at the earthquake stations plays a major role in achieving the aforementioned objectives. Site conditions are generally represented by the time-averaged shear wave velocity in the upper 30 meters of the geological materials (Vs30). Several strong motion stations lack Vs30 measurements resulting in potentially inaccurate assessment of seismic hazards and evaluation of ground motion records. In this study, we present a deep learning-based approach for predicting Vs30 at strong motion station locations using three-channel earthquake records. For this purpose, Convolutional Neural Networks (CNNs) with dilated and causal convolutional layers are used to extract deep features from accelerometer records collected from over 700 stations located in Turkey. In order to overcome the limited availability of labeled data, we propose a two-phase training approach. In the first phase, a CNN is trained to estimate the epicenters, for which ground truth is available for all records. After the CNN is trained, the pre-trained encoder is fine-tuned based on the Vs30 ground truth. The performance of the proposed method is compared with machine learning models that utilize hand-crafted features. The results demonstrate that the deep convolutional encoder based Vs30 prediction model outperforms the machine learning models that rely on hand-crafted features. This suggests that our computational model can extract meaningful and informative features from the accelerometer records, enabling more accurate Vs30 predictions. The findings of this study highlight the potential of deep learning-based approaches in seismology and earthquake engineering. © 2024, International Association for Earthquake Engineering. All rights reserved.
  • Thumbnail Image
    Conference Object
    Representing Earthquake Accelerogram Records for Cnn Utilization
    (IEEE, 2020) Cikis, Melis; Tileyoğlu, Salih; Akagündüz, Erdem
    In this study, a spectrogram based false color representation of earthquake accelergrams is proposed and its usability for both human investigation and its application in convolutional networks are discussed. By using more than forty two thousand earthquake records open to the public, an epicenter clustering algorithm was employed, and it was observed that earthquakes in similar clusters produce similar representations. The prospective purpose of the proposed representation is to estimate the epicenter of an earthquake by processing the accelerograms recorded in a single station using convolutional networks.
  • Thumbnail Image
    Article
    Exploring Challenges in Deep Learning of Single-Station Ground Motion Records
    (Springer Science and Business Media Deutschland GmbH, 2025) Çaǧlar, Ü.M.; Yilmaz, B.; Türkmen, M.; Akagündüz, E.; Tileylioglu, S.
    Contemporary deep learning models have demonstrated promising results across various applications within seismology and earthquake engineering. These models rely primarily on utilizing ground motion records for tasks such as earthquake event classification, localization, earthquake early warning systems, and structural health monitoring. However, the extent to which these models truly extract “deep” patterns from these complex time-series signals remains underexplored. In this study, our objective is to evaluate the degree to which auxiliary information, such as seismic phase arrival times or seismic station distribution within a network, dominates the process of deep learning from ground motion records, potentially hindering its effectiveness. Our experimental results reveal a strong dependence on the highly correlated Primary (P) and Secondary (S) phase arrival times. These findings expose a critical gap in the current research landscape, highlighting the lack of robust methodologies for deep learning from single-station ground motion recordings that do not rely on auxiliary inputs. © 2025 Elsevier B.V., All rights reserved.
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    Conference Object
    BERT for Harmonic Time Series Modeling: A Multi-Stage Fine-Tuning Approach
    (IEEE, 2025) Hekimoglu, Nevin Sehbal; Tileylioglu, Salih; Akagunduz, Erdem
    This study demonstrates the potential of a BERT-based transformer model in harmonic signal modeling using synthetic sinusoidal data. The model was trained through a three-stage fine-tuning process (reconstruction, linear analysis, full tuning) with a masked language modeling approach. In the first stage, the model successfully filled in missing data and learned the basic features, while in subsequent stages, its ability to capture temporal dependencies and sequential patterns was enhanced. Additionally, patch, time, and station embedding strategies effectively represented the harmonic structure of the signal. The results indicate that pre-training with synthetic data can overcome the limited access to real-world data, allowing transformer models to be efficiently used in these types of problems.
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    Conference Object
    Training and Evaluation of a Variational Autoencoder for Seismic Station Data Analysis
    (IEEE, 2025) Gurkan, Delfin Bengisu; Tileylioglu, Salih; Akagunduz, Erdem
    In this study, a variational autoencoder model is proposed to encode the geological, geophysical, and geographical data of seismic stations in Turkey. The model encodes various station-specific data, such as site frequency, surface lithology, and latitude-longitude, into a low-dimensional latent space, aiming to disentangle the generative factors of these data and improve their representation. This approach effectively represents the regional characteristics surrounding the station, enabling the disentanglement of station-related effects. Evaluations based on disentanglement and completeness scores indicate that the model successfully distinguishes station characteristics, such as the average shear wave velocity in the top 30 meters of the surface. The resulting station data encoder can provide additional information to deep learning models processing acceleration records, contributing to a better understanding and modeling of station effects in seismic analysis.
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    Conference Object
    Generation and Analysis of Strong Motion Signals via Diffusion Model
    (IEEE, 2025) Dogrusoz, Rem; Yilmaz, Baris; Tileylioglu, Salih; Akagunduz, Erdem
    This study examines the potential of Denoising Diffusion Probabilistic Models in earthquake engineering to generate seismic signals and learn deep representations. The complex nature of seismic data and its noise are major obstacles that hinder the extraction of meaningful features. Traditional supervised learning methods are limited in their generalization capacity due to their dependence on labeled data. Diffusion models, however, promise to overcome these limitations by generating conditional seismic signals and enhancing the reliability of early warning systems. This study aims to demonstrate how diffusion-based methods contribute to earthquake engineering and propose an approach for seismic data analysis and detection of the P-wave arrival time. The obtained results show that the model can grasp certain patterns; however, larger-scale datasets are needed for more realistic signal generation and a deeper understanding of seismic features.