Precision of Global Navigation Satellite Systems Based Earthquake Observations

Year 2019, Volume: 1 Issue: 1, 48 - 62, 26.06.2019

Murat Şentürk , Bahadır Aktuğ

https://doi.org/10.46464/tdad.566342

Cited By: 1

Abstract

In this
study, accelerometer and GNSS observations were carried out for different
earthquakes on the shake table and the differences between the observations and
the actual input were examined in both time and frequency domains. When the
waveforms obtained from the measured GNSS and acceleration displacement
waveforms are compared with the actual input, the Root Mean Square (RMS) error
values of GNSS vary between 4 and 9 mm while the RMS values of the displacement
waveforms obtained from the acceleration records vary between 1 and 110 mm.
Besides, the average RMS values of the GNSS displacement waveforms are around
~6 mm. In the signal coherence analysis, the coherence between the acceleration
measurements and the actual input signal is observed only at frequencies higher
than 2-3 Hz verifying that the coherence at lower frequencies is low for
accelerometers whereas the coherence between GNSS and the actual input signal
is observed to be flat at low frequencies up to 1 Hz. 

Keywords

GNSS, Acceleration, Displacement, RMS error, Signal coherence analysis

Supporting Institution

TÜBİTAK

Project Number

116Y199

Thanks

The results of this study were obtained from the project titled ‘Determination of High Precision Broadband Displacements from Geodetic Measurements-TUBITAK-116Y199’ which is supported by TUBITAK

Küresel Konumlama Uydu Sistemleri Tabanlı Deprem Gözlemlerinin Duyarlığı

Abstract

Bu
çalışmada, sarsma tablası üzerinde farklı depremler için ivmeölçer ve Küresel Konumlama
Uydu Sistemleri (KKUS) gözlemleri yapılmış ve gözlemler ile gerçek girdi
arasındaki farklar zaman ve frekans ortamında incelenmiştir. Ölçülen KKUS yer değiştirme
dalga formları ve ivme kayıtlarından elde edilen dalga formları gerçek girdi
ile karşılaştırıldığında KKUS’un Karekök Ortalama (RMS) hata değerleri 4-9 mm
arasında değişirken, ivme kayıtlarından elde edilen yer değiştirme dalga
formlarının RMS değerleri 1-110 mm arasında değişmektedir. KKUS yer değiştirme
dalga formlarının ortalama RMS değerleri ~6 mm civarındadır. Yapılan sinyal
tutarlık analizlerinde, ivme kayıtları ile gerçek girdi sinyali arasındaki
tutarlığın 2-3 Hz’den daha yüksek frekanslarda gözlendiği, düşük frekanslarda
tutarlığın düşük olduğu buna karşın KKUS ile gerçek girdi sinyali arasındaki
tutarlığın 1 Hz’e kadar olan düşük frekanslarda düz olduğu gözlenmektedir.

Keywords

KKUS, İvmeölçer, Yer değiştirme, RMS hata, Sinyal tutarlık analizi

Project Number

116Y199

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