Twelve years of ground-tilt measurements on the Soufriere of St. Vincent, 1977?1989

1990 ◽  
Vol 52 (3) ◽  
pp. 227-241 ◽  
Author(s):  
R S Fiske ◽  
J B Shepherd
Keyword(s):  
Ground Tilt

Seismically Derived Ground Tilts Related to the 2010 Chilean Tsunami

2021 ◽  
Author(s):  
Jui-Chun Freya Chen ◽  
Wu-Cheng Chi ◽  
Chu-Fang Yang
Keyword(s):  
Deep Ocean ◽  
Propagation Model ◽  
Ocean Bottom ◽  
Ocean Bottom Seismometer ◽  
Tsunami Propagation ◽  
Ground Tilt ◽  
Tsunami Waves ◽  
The Pacific ◽  
Seismic Networks ◽  
Back Azimuth

Abstract Developing new ways to observe tsunami contributes to tsunami research. Tidal and deep-ocean gauges are typically used for coastal and offshore observations. Recently, tsunami-induced ground tilts offer a new possibility. The ground tilt signal accompanied by 2010 Mw 8.8 Chilean earthquake were observed at a tiltmeter network in Japan. However, tiltmeter stations are usually not as widely installed as broadband seismometers in other countries. Here, we studied broadband seismic records from Japan’s F-net and found ground tilt signals consistent with previously published tiltmeter dataset for this particular tsunamic event. Similar waveforms can also be found in broadband seismic networks in other countries, such as Taiwan, as well as an ocean-bottom seismometer. We documented a consistent time sequence of evolving back-azimuth directions of the tsunami waves at different stages of tsunami propagation through beamforming-frequency–wavenumber analysis and particle-motion analysis; the outcomes are consistent with the tsunami propagation model provided by the Pacific Tsunami Warning Center. These results shown that dense broadband seismic networks can provide a useful complementary dataset, in addition to tiltmeter arrays and other networks, to study or even monitor tsunami propagation using arrayed methods.

scholarly journals Ground-tilt Observations by a 100m and a 330m Half-filled Water-tube Tiltmeter in the Kiriyama Water-pipe Tunnel in the Tokai Area

1992 ◽  
Vol 45 (2) ◽  
pp. 259-261
Author(s):  
Osamu OKITSU ◽  
Yutaka HIRATA ◽  
Toshi ASADA ◽  
Hideo TSUNAKAWA ◽  
Shinichi KIKUCHI ◽  
...  
Keyword(s):  
Water Pipe ◽  
Ground Tilt ◽  
Water Tube

Rotational motions of the Ms7.0 Jiuzhaigou earthquake with ground tilt data

2019 ◽  
Vol 62 (5) ◽  
pp. 832-842
Author(s):  
Cong Zhou ◽  
Xiangzhi Zeng ◽  
Qingliang Wang ◽  
Wenyi Liu ◽  
Cuizhi Wang
Keyword(s):  
Jiuzhaigou Earthquake ◽  
Ground Tilt ◽  
Rotational Motions

scholarly journals Ground tilt changes in Japan caused by the 2010 Maule, Chile, earthquake tsunami

2013 ◽  
Vol 118 (1) ◽  
pp. 406-415 ◽  
Author(s):  
Takeshi Kimura ◽  
Sachiko Tanaka ◽  
Tatsuhiko Saito
Keyword(s):  
Ground Tilt ◽  
Chile Earthquake

scholarly journals Some Investigations on a Possible Relationship between Ground Deformation and Seismic Activity at Campi Flegrei and Ischia Volcanic Areas (Southern Italy)

Geosciences ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 222 ◽  
Author(s):  
Ciro Ricco ◽  
Simona Petrosino ◽  
Ida Aquino ◽  
Carlo Del Gaudio ◽  
Mariarosaria Falanga
Keyword(s):  
Seismic Activity ◽  
Ground Deformation ◽  
Earth Tides ◽  
Quality Data ◽  
Campi Flegrei ◽  
Joint Analysis ◽  
Time Interval ◽  
Ground Tilt ◽  
Tectonic Earthquakes ◽  
Solid Earth Tides

In the present paper, we analyse ground tilt and seismicity at Campi Flegrei caldera and Ischia Island, two volcanic areas located in the south of Italy. These areas have been well studied for many years from a petrological, volcanological and geophysical view point. Moreover, due to the high seismic and volcanic risk for the populations living there, they are continuously monitored by networks of geophysical and geochemical sensors. We summarize the most important results that we obtained so far, concerning the observations of relationships between seismic activity and ground tilt anomalies, focusing on the time interval 2015–2018. First, we present a detailed description of the tiltmeter and seismic networks in both the investigated areas, as well as their development and improvement over time that has enabled high quality data collection. From the joint analysis of the seismic and borehole tiltmeter signals, we often notice concurrence between tilt pattern variations and the occurrence of seismicity. Moreover, the major tilt anomalies appear to be linked with the rate and energy of volcano-tectonic earthquakes, as well as with exogenous phenomena like solid Earth tides and hydrological cycles. The analysis that we present has potential applicability to other volcanic systems. Our findings show how the joint use tilt and seismic data can contribute to better understanding of the dynamics of volcanoes.

Recovering Seismic Displacements from Underground Strong-Motion Acceleration Records of the 2011 MW9.0 Tohoku Earthquake in Japan

2013 ◽  
Vol 671-674 ◽  
pp. 1418-1422
Author(s):  
Heng Li ◽  
Shui Ming Zheng ◽  
Chen Song ◽  
Qian Feng
Keyword(s):  
Strong Motion ◽  
Tohoku Earthquake ◽  
Error Processing ◽  
Average Error ◽  
Gps Data ◽  
Error Source ◽  
Ground Tilt ◽  
Straight Line ◽  
Step Algorithm ◽  
Seismic Displacements

The borehole strong-motion (SM) records from the 2011 MW9.0 Tohoku earthquake are analyzed, and we find ground tilt is the main error source of the SM records. The assumption is made that the time in when ground tilt fluctuates tempestuously (transient tilt) can be determined by the vertical velocity time-series. Then, we propose a two-step algorithm to correct these errors, which involves fitting a straight line to the tail portion of velocity for permanent tilt and average error processing of the transient tilt and noises caused by it. The transient tilt is unknown, but its final influence can be estimated as the velocity at the time when strong shaking ceased. The horizontal accelerograms are corrected and the displacements are obtained by double integration. Comparing with the GPS data, seismic displacements can be recovered by the corrected underground SM acceleration records.

scholarly journals High-bandwidth beam balance for vacuum-weight experiment and Newtonian noise subtraction

2021 ◽  
Vol 136 (3) ◽  
Author(s):  
Enrico Calloni ◽  
◽  
Keyword(s):  
Vacuum Energy ◽  
Low Frequency ◽  
Environmental Data ◽  
High Frequency Region ◽  
Optical Components ◽  
Ground Tilt ◽  
Beam Balance ◽  
Frequency Regime ◽  
High Bandwidth ◽  
And Control

AbstractWe report the experimental results of a prototype balance for the Archimedes experiment, devoted to measure the interaction between quantum vacuum energy and gravity. The prototype is a beam balance working at room temperature which shares with the final balance several mechanical and optical components. The balance sensitivity has been tested at the site of the Virgo gravitational wave detector in order to benefit from its quiet environment and control facilities. This allowed also the test of the coherence of the balance data with the Virgo interferometer signal and with the environmental data. In the low-frequency regime, the balance has shown a sensitivity of about $$8\times 10^{-12} {\text {Nm}}/\sqrt{\text {Hz}}$$ 8 × 10 - 12 Nm / Hz , which is among the best in the world, and it is very promising toward the final Archimedes measurement. In the high-frequency region, above a few Hz, relying on the behavior of the balance as a rotational sensor, the ground tilt has been measured in view of the next work devoted to Newtonian noise subtraction (NNS) in Virgo. The measured ground tilt reaches a minimum of about $$8\times 10^{-11} {\text {rad}}/\sqrt{{\text {Hz}}}$$ 8 × 10 - 11 rad / Hz in the few Hz region and ranges from $$10^{-10}$$ 10 - 10 to $$10^{-9} {\text {rad}}/\sqrt{{\text {Hz}}}$$ 10 - 9 rad / Hz in the 10–20 Hz region, where a very interesting coherence, at some frequencies, with the Virgo interferometer signal is shown.

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