World-wide synthetic tide parameters for gravity and vertical and horizontal displacements

Zahran, Khaled; Jentzsch, G.; Seeber, Günter

doi:10.1007/s00190-005-0460-3

Cited by 10 publications

(8 citation statements)

References 23 publications

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“…This ratio is represented as a complex, which includes amplitude factor and phase difference. The modeled gravity in the present paper is the addition of ocean tide loading and tidal gravity obtained from an elastic Earth model (XU et al, 1999;Zahran et al, 2005). Consequently, the construction of tidal parameter involves tidal gravity from an Earth model and ocean tide loading.…”

Section: Synthesizing Of Tidal Parameter For Gravitymentioning

confidence: 98%

“…Therefore, the tidal gravity observation can be modeled by ocean tide loading and theoretical value of Earth's tide. Zahran et al (2005) constructed the synthetic tidal parameters for gravity over continents of the world with spatial resolution 0.5° using ocean tide models of CSR3.0, TPXO2 and FES95.2. They also compared the parameters with the gravity observations and pointed out that they were in a good agreement.…”

Section: Introductionmentioning

confidence: 99%

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Synthetic tidal parameters for gravity over China and its neighbor area

Zhou

Sun

2007

Acta Seismol. Sin.

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The synthetic tidal parameters with high spatial resolution for gravity over China and its neighbor area are constructed with Earth's tidal model and ocean tide loading calculated using TPXO7 global ocean tide model as well as tidal data over China seas. The comparison between synthetic parameters and ones observed by spring gravimeters at some seismic network stations and Hong Kong station and one observed by super-conducting gravimeter at Wuhan station shows that the average differences in amplitude factors and phases are smaller than 0.005 and 0.5° respectively; and that the discrepancies between observational and synthetic parameters are dependent on gravimetric technique in that the synthetic parameters are in well agreement with the superconducting gravimetric observations. This also indicates that the synthetic result is a good estimation for tidal gravity, and the numerical results in the present paper not only can provide ground and space gravimetry such as absolute gravimetry with correction model of tidal gravity, but also provide effective tidal parameters over areas where no observation is carried out.

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Section: Synthesizing Of Tidal Parameter For Gravitymentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Synthetic tidal parameters for gravity over China and its neighbor area

Zhou

Sun

2007

Acta Seismol. Sin.

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“…Between the two direct effects caused by the gravitational attraction of the Moon and Sun, solid Earth and ocean tides, the former can be described more easily (e.g. Farrell, 1972Farrell, , 1973Scherneck, 2001;Zahran et al, 2005;Agnew, 2007). The Ocean Tide Loading (OTL) calculations require the computation of the tidal load numbers (Farrell, 1972).…”

Section: Calculation Of Tides and Ocean Tidal Loading (Otl)mentioning

confidence: 99%

Tidal Coulomb Failure Stresses in the northern Andean intermediate depth seismic clusters: Implications for a possible correlation between tides and seismicity

2019

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A recent statistical analysis of the relationship between tides and seismic activity in Colombia has suggested the existence of correlation anomalies for the case of intermediate depth events in the Bucaramanga nest and the Cauca cluster (Moncayo et al., 2019). In this work, we explore in detail the hypothesis that tides may be triggering seismic activity in these regions and extend the analysis to two other seismic clusters in northern-central South America, specifically in the areas of El Puyo (Ecuador) and Pucallpa (Peru). For this purpose, we use the available focal mechanism information for seismic events at these locations, and calculate for each event the Tidal Coulomb Failure Stress (TCFS) as obtained from estimations of the tidal strain tensor. Tidal strains are computed considering the Earth body tides and the effect of the ocean tidal loading. Since our purpose is to elucidate the role of tides in earthquake nucleation, calculations of the TCFS are conducted not only for the time of earthquake, but also for the time of the closest maximum strain within a window of a few hours before the events. Our results tend to support the hypothesis that tidal stresses are contributing to earthquake generation in all the studied areas; this trend is especially stronger when TCFS are calculated at pre-earthquake times. The physical explanation for the positive contribution of tides to earthquake triggering in intermediate depth clusters may lie in the fact that a wide diversity of fault plane orientations is possible within a relatively small volume of subducted lithosphere, so making the tides more likely to help loosening up the blocks at the fault plane to promote slip.

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“…The modelled tidal factors A m and α m are usually used to compute gravity tides predictions (Zahran et al, 2005) and one of the main goals of this work is to assess the accuracy of such tidal predictions across Siberia. It is an important topic as absolute gravity measurements are routinely performed in the area for tectonic activity monitoring (Stus et al, 1995;Kalish et al, 2000;Arnautov et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

A Trans-Siberian Tidal Gravity Profile (TSP) for the validation of the ocean tides loading corrections

Ducarme

Timofeev

Everaerts

et al. 2008

Journal of Geodynamics

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Tidal gravity observations have been performed across Siberia, along a profile extending from Novosibirsk to the West until Sakhalin Island to the East. All the stations were occupied by the same instrument (LCR402) for periods ranging from one to more than 2 years. The first goal was to compare the observed tidal parameters of the main tidal waves O1, K1 and M2 with modelled ones computed from nine different ocean tides models: SCW80, ORI96, CSR3, FES95, FES02, CSR4, GOT00, NAO99 and TPX06. In order to assess the overall accuracy of tidal predictions across Siberia, we selected also the best ocean tides models for long period tides, on the basis of previous comparisons.The observed amplitude factors and phase differences agree with the modelled ones within the associated RMS errors, generally at the level of 0.3%. On the other hand, the predicted tidal factors, computed from different ocean tides models, exhibit a high level of consistency (0.15%) on the Siberian territory. The tidal load vectors agree within 1 nm s −2 . A mean of the different load vectors will provide the most precise corrections, except in the area of the Sakhalin Island, where the most recent models fit better the observations. The final conclusion is that gravity tides predictions, based on the mean of the most recent ocean tides models, have a precision of the order of 5 nm s −2 on the Siberian territory.

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World-wide synthetic tide parameters for gravity and vertical and horizontal displacements

Cited by 10 publications

References 23 publications

Synthetic tidal parameters for gravity over China and its neighbor area

Synthetic tidal parameters for gravity over China and its neighbor area

Tidal Coulomb Failure Stresses in the northern Andean intermediate depth seismic clusters: Implications for a possible correlation between tides and seismicity

A Trans-Siberian Tidal Gravity Profile (TSP) for the validation of the ocean tides loading corrections

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