New Seismic Noise Models Obtained Using Very Broadband Stations

el-aal, Abd el-aziz Khairy Abd; Soliman, M. Sami

doi:10.1007/s00024-013-0640-7

Cited by 16 publications

(3 citation statements)

References 10 publications

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“…The figure [2][3][4] shows the result of probability power spectral density, which related plotted in power amplitude (dB) versus periods (s) [7], [12], [14]- [17]. The upper black solid line means that the New High Noise Model (NHNM) and the lower means that the New Low Noise Model.…”

Section: Resultsmentioning

confidence: 99%

Spectral Probability Density for Broadband Seismic Ambient Noise Level

Sari¹,

Panjaitan²,

Sunandar³

et al. 2021

JoCPES

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The time-series approach is commonly utilized to get to the estimation of the likelihood thickness work of control ghostly densities (PDF PSD) of waveform information. This paper is concerned with the introduction of the evaluation of waveform commotion to degree the likelihood thickness work (PDF) be done inside, we utilized the metadata from a stock, a parser occurrence of DNP (Denpasar, Bali, Indonesia), IGBI (Ingas, Bali, Indonesia), and PLAI (Plampang, NTB, Indonesia) from BMKG IA-Networks and computations are based on the schedule utilized by McNamara Demonstrate. The point of this paper to characterize the current and past execution of the stations and recognizing the data on clamor levels at BMKG IA-Networks Station. The result of this paper shows the consistency of the unearthly is displayed the DNP, IGBI, and PLAI organize to confirm the quality of information conjointly acts as a test execution broadband arrange to the time taken by the broadband organize within the field and examination the Lombok earthquake in 2018.

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Section: Resultsmentioning

confidence: 99%

Spectral Probability Density for Broadband Seismic Ambient Noise Level

Sari¹,

Panjaitan²,

Sunandar³

et al. 2021

JoCPES

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“…The sub-centers collect data from the nearest stations and also send it to Helwan via satellite. More details about ENSN sensors, acquisitions, and data processing and analysis can be found in [17][18].The dramatic increase in deployment of broadband and very broadband seismic stations in Egypt after 2009 with real-time continuous telemetry has meant that moment tensor determinations have become increasingly feasible, and moment tensor solutions are now a very important product of ENSN. We used a very well-established method [19][20][21][22] and software to perform waveform inversion for the main shock of the 3 September, 2015 earthquake south of El-Dabaa city using waveform data recorded by ENSN broadband and very broadband stations, Fig.…”

Section: Waveform Inversion and Earthquake Source Characterizationmentioning

confidence: 99%

Source Characterization and Ground Motion Modeling Computed From the 3 September 2015 Earthquake, Western Desert, Egypt

el-aal¹,

Tarabees²,

Badreldin³

2017

GEOMATE

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To obtain the characterized source model for prediction of strong ground motions, the ground motion generation area and rupture geometry of an inland crustal earthquake from near-source ground motion records has been estimated. An earthquake, with a magnitude of 4.3 ML and a focal depth of 18 km occurred on September 3, 2015 at 30.45N, 28.44E in the Western Desert of Egypt about 60 km south of El-Dabaa city. This earthquake is the first instrumentally recorded earthquake occurring in this area in several decades. The waveform data of this event has been used for source characterization and ground motion modeling. The present work describes the results of a preliminary study conducted to obtain fault plane solutions of this earthquake from waveform inversion and P-wave polarity. For this purpose, the source parameters related to the strong ground motion were estimated by waveform data and first arrivals recorded by the Egyptian National Seismic Network (ENSN) are used to arrive at focal mechanism solutions. Fault plane solutions for the main shock indicate strike-slip motion. One nodal plate strikes about 330°, is nearly vertical, and indicates right lateral slip. The other nodal plane strikes about 240°, dips very steeply NW, and indicates left lateral slip. Also the peak ground acceleration (PGA) at the El-Dabaa site has been simulated by taking into account an accurate estimation of the source characterization, the path attenuation model, and site amplification. The results have been validated using an actual recording of PGA at one ENSN station that recorded strong ground motion.

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“…Application of the passive seismic techniques is used frequently in Egypt to obtain fundamental site frequency and amplification factors for seismic hazard assessment at several areas (Abd el-aal, 2008(Abd el-aal, , 2010a(Abd el-aal, , 2010b(Abd el-aal, , 2010c(Abd el-aal, , 2013Abdel-Rahman et al, 2012;El-Hady et al, 2012;Toni, 2007Toni, , 2012Abd el-aal and Soliman, 2013;El-Eraki et al, 2013;Abd el-aal et al, 2015). The rapid increasing in urbanization, tourist beach resorts and land use planning in the Red Sea coastal areas are the motivation of the current study.…”

Section: Introductionmentioning

confidence: 98%

Ambient noise for determination of site dynamic properties at Hurghada and Safaga cities, Red Sea, Egypt

Toni¹

2016

Acta Geodynamica Et Geomaterialia

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Recording ambient noise at the surface is increasingly used for the assessment of site response and has become a fundamental task for seismic risk reduction in urbanized areas. Methods based on the measurement of seismic noise, which typically are fast, non invasive, and low cost, have become a very attractive option in microzonation studies. In the current work, we use the ambient noise recordings collected by single seismic stations and two-dimensional arrays to determine the response of the near-surface soil at the two touristic cities of Hurghada and Safaga which are located at the Red Sea coast in Egypt. Based on the horizontal-to-vertical (H/V) spectral ratio Nakamura's technique, recordings of the single stations are analyzed to estimate the fundamental site frequency (f 0 ). Using the raw noise signals recorded by two arrays, we present a joint inversion scheme for surface wave dispersion curves. In particular, the Rayleigh wave dispersion curves and the H/V curves are combined in a joint inversion procedure. We present inversion procedure based on the computation of high-frequency correlation functions between arrays' stations. The calculation of Rayleigh wave phase velocities is based on the frequency-domain SPatial AutoCorrelation (SPAC) and frequency-wavenumber (f-k) methods. Constitutively, a tomographic inversion of the travel-times estimated for each frequency is performed, allowing the vertically varying 1-D shear wave velocity structure below the array to be retrieved. Following the relationship between resonance frequency (f 0 ) and thickness of sediments, the thickness of unconsolidated sediments at the investigated sites are determined. ARTICLE INFO

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New Seismic Noise Models Obtained Using Very Broadband Stations

Cited by 16 publications

References 10 publications

Spectral Probability Density for Broadband Seismic Ambient Noise Level

Spectral Probability Density for Broadband Seismic Ambient Noise Level

Source Characterization and Ground Motion Modeling Computed From the 3 September 2015 Earthquake, Western Desert, Egypt

Ambient noise for determination of site dynamic properties at Hurghada and Safaga cities, Red Sea, Egypt

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