A procedure for tidal analysis with a Bayesian information criterion

Tamura, Yoshiaki; Sasajima, Tadahiro; Ooe, M.; Ishiguro, Makio

doi:10.1111/j.1365-246x.1991.tb05697.x

Cited by 395 publications

(230 citation statements)

References 12 publications

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“…Gray and solid lines denote water level data observed with floating-type and pressure-type water level gauges, respectively. (e) Superconducting gravity data processed with BAYTAP-G (Tamura et al, 1991). Solid and gray lines are trend component, g obs (t), and the irregular component (i.e., gravity observation noise).…”

Section: Observations At Isawa Fanmentioning

confidence: 99%

“…(Water electrical conductivity at Suginodo Spring (circle in Fig. 1 (Tamura et al, 2005), and divided into tidal, barometric, trend and irregular components by using the BAYTAP-G software package (Tamura et al, 1991). In addition, effects from the long-period tide, the polar motion and the arbitrary linear drift (−0.095 µgal/day) were corrected in the trend components.…”

Section: Observations At Isawa Fanmentioning

confidence: 99%

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Gravity changes associated with variations in local land-water distributions: Observations and hydrological modeling at Isawa Fan, northern Japan

et al. 2012

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Gravity changes associated with variations in local land-water distributions have been observed at Isawa Fan in northern Japan, and modeled by hydrological equations. We solve the Richards equation numerically for the time variation in the vertical soil moisture distribution, which is then spatially integrated to estimate gravity changes due to the soil moisture distribution. In modeling Isawa Fan, we assume a simple hydrological model: a horizontally homogeneous soil in an infinite half-space. The estimated gravity is consistent with the observed gravity during a 50-day period within about 0.4 µgal root mean square, owing to both observed soil parameter values and the observation building geometry being incorporated into the hydrological model. However, the estimated gravity cannot fully reproduce annual gravity changes observed during a 2-year time frame, because the boundary conditions in the modeling determine only local water distributions and the resultant short-period gravity changes. Instead, the observed gravity over these 2 years can be reproduced within about 1.0 µgal root mean square, if the additional parameters of the annual gravity change (A ac and A as ) and the snowfall effect (A s ) are calculated by the function regression to the observed gravity with the least-squares method. The hydrological modeling techniques presented here can be utilized at all gravity sites in flat areas similar to Isawa Fan, such that hydrological effects in gravity data can be corrected and mass transfers associated with earthquakes and volcanoes can be monitored.

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Section: Observations At Isawa Fanmentioning

confidence: 99%

Section: Observations At Isawa Fanmentioning

confidence: 99%

Gravity changes associated with variations in local land-water distributions: Observations and hydrological modeling at Isawa Fan, northern Japan

et al. 2012

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“…Although ocean tide is the most prominent cause of variation in ocean bottom pressure, its effect can be accurately corrected using an ocean tide model (e.g., NAO.99b, Matsumoto et al, 2000) or harmonic analysis (e.g., BAYTAP-G, Tamura et al, 1991) owing to the precisely determined periods of the tidal components. Atmospheric pressure variation is basically compensated at the sea surface, and its effect on bottom pressure is usually neglected.…”

Section: Instruments and Some Results Of Observationsmentioning

confidence: 99%

Seafloor Geodetic Approaches to Subduction Thrust Earthquakes

Fujimoto¹

2014

Monogr. Environ. Earth Planets

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Observation systems and some observed results of seafloor geodesy are reviewed with a focus on the research activities of Japanese groups, especially those of Tohoku University. Seafloor acoustic ranging has been adopted as the simplest way to continuously monitor local crustal activities. The GPS-Acoustic (GPSA) method has been the most important for seafloor positioning. It seems that commercial technologies can be used to lessen the considerable differences in repeatability and spatio-temporal resolution of GPSA and land based GPS. Ocean bottom pressure sensors have been used to continuously monitor vertical crustal movements. Improvements in the resolution and long-term stability of pressure sensors will lead to monitoring slow slip events and interplate locking. Ocean bottom and underwater gravimeters have been developed for precise gravity mapping and monitoring mass change beneath the seafloor. The 2011 Tohoku-oki earthquake is an historical event demonstrating that seafloor geodetic observations are crucial to understanding the mechanism of giant earthquakes. Coseismic displacements detected through geodetic observations on the seafloor have indicated huge slips on the shallow part of the plate boundary. A slow slip event near the zone of the coseismic slip preceding the main event has been detected from slight pressure variations. This illustrates the importance of real-time monitoring with a cabled seafloor observatory, which is also a key to establishing a reliable early tsunami warning system.

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“…A sensor direction is then corrected for each station based on teleseismic waves (Shiomi et al, 2003). Tidal components are estimated and removed with the BAYTAP-G program (Tamura et al, 1991). An atmospheric pressure response is also removed with BAYTAP-G for the medium-term records (2) based on hourly-observed atmospheric pressure data at a meteorological observatory of the Japan Meteorological Agency (Morioka for group A, and Fukushima for group B in Fig.…”

Section: Tilt Data Before the Mainshockmentioning

confidence: 99%

Tilt records prior to the 2011 off the Pacific coast of Tohoku Earthquake

Hirose

2011

Earth Planet Sp

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The 2011 off the Pacific coast of Tohoku Earthquake was an unexpected megathrust event with magnitude 9.0 along the Japan trench. Hi-net tilt records prior to the great earthquake are examined in order to determine whether a precursory tilt change is observed in the short-term (∼days) and medium-term (∼a month) for confirming a preslip hypothesis and the effectiveness of an earthquake prediction method based on that hypothesis. For a quantitative reference to the observation, the detectability of the tilt observation for interplate slip on the subducting Pacific plate is also evaluated. In this study, no clear signal of preseismic tilt change or preslip is found in the records. This means that there is no preslip larger than moment magnitude (M w ) 6.2 on the deeper extension of the earthquake source area on the plate interface or larger than M w 7.3 near the hypocenter.

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A procedure for tidal analysis with a Bayesian information criterion

Cited by 395 publications

References 12 publications

Gravity changes associated with variations in local land-water distributions: Observations and hydrological modeling at Isawa Fan, northern Japan

Gravity changes associated with variations in local land-water distributions: Observations and hydrological modeling at Isawa Fan, northern Japan

Seafloor Geodetic Approaches to Subduction Thrust Earthquakes

Tilt records prior to the 2011 off the Pacific coast of Tohoku Earthquake

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