Chun-Chi Liu

Institute of Earth Sciences, Academia Sinica

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Bor‐Shouh Huang

Institute of Earth Sciences, Academia Sinica

Win‐Gee Huang

Institute of Earth Sciences, Academia Sinica

Kou-Cheng Chen

Institute of Earth Sciences, Academia Sinica

Chin‐Shang Ku

Institute of Earth Sciences, Academia Sinica

Shu-Hjong Tsao

Ministry of Economic Affairs

Chi-Hsuan Chen

Ministry of Economic Affairs

Yu‐Chung Hsieh

Ministry of Economic Affairs

Chin-Ren Lin

Academia Sinica

Chin‐Jen Lin

Institute of Earth Sciences, Academia Sinica

Simon Lin

Centre for Cosmology and Particle Physics Phenomenology

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Institute of Earth Sciences, Academia Sinica

Academia Sinica

National Taiwan University

National Central University

National Chung Cheng University

California Institute of Technology

Ministry of Economic Affairs

Central Geological Survey, MOEA

University of Illinois Urbana-Champaign

University of California, Berkeley

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Correcting the Background Tilt Signal of the Horizontal Seismometer Using a Rotation Sensor

Seismological Research Letters (2022)

Chin‐Jen Lin Chin‐Shang Ku Tsung-Chih Chi Bor‐Shouh Huang Hsin‐Hua Huang

Abstract In observational seismology, the long-period background noise level in horizontal seismometer components is always higher than the vertical component at the same location. It is believed that the horizontal long-period noise is mostly attributed to ground tilt, yet the authentic tilt recordings of background noise in the seismic frequency band (0.01–20 Hz) have not been recorded successfully. We demonstrate the use of a newly developed optical-based rotation sensor, blueSeis-3A, to correct for the tilt effect in a horizontal seismometer. A station with a horizontal long-period (1 < T < 100 s) background noise level higher than the global new high-noise model was chosen, where a seismometer, a tiltmeter, and a rotation sensor were collocated. We first confirmed that the horizontal recordings from a tiltmeter and a seismometer were visually consistent, although it was unclear if tilt contamination existed in both recordings. It became evident until the ground tilt recorded by a rotation sensor was found to be waveform-matched with them, indicating that both sensors were contaminated by tilt. The spectrum of tilt records showed that ground tilts were mostly at period bands >1 s. By subtracting tilt from seismometer records, the horizontal background noise levels could be improved, approximately to the resolution level of the rotation sensors. Our results demonstrate that collocating rotation sensors with seismometers is a feasible way to improve the quality of the long-period background noise level in seismometer horizontal components when rotation sensors are sufficiently sensitive.

Seismometer

Tiltmeter

Tilt sensor

Seismic Noise

10.1785/0220210185

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Citations (2)

Observations Using the Taipei Basin Broadband Downhole Seismic Network: The 26 December 2006, Pingtung Earthquake Doublet, Taiwan

Terrestrial Atmospheric and Oceanic Sciences (2008)

Win‐Gee Huang Bor‐Shouh Huang Kou-Cheng Chen Chun-Chi Liu Chin-Ren Lin

10.3319/tao.2008.19.6.761(pt)

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Citations (2)

Portable broadband seismic network in Vietnam for investigating tectonic deformation, the Earth’s interior, and early-warning systems for earthquakes and tsunamis

Journal of Asian Earth Sciences (2009)

Bor‐Shouh Huang Tu Son Le Chun-Chi Liu Đinh Văn Toàn Win‐Gee Huang

Pacific Plate

10.1016/j.jseaes.2009.02.012

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Citations (21)

Academia Sinica, TW E-science to Assistant Seismic Observations for Earthquake Research, Monitor and Hazard Reduction Surrounding the South China Sea

Springer eBooks (2010)

Bor‐Shouh Huang Chun-Chi Liu Eric Yen Wen‐Tzong Liang Simon Lin

10.1007/978-1-4419-6469-4_12

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Citations (0)

Investigation of array-derived rotation in TAIPEI 101

Journal of Seismology (2012)

Chin‐Jen Lin Wen-Gee Huang Han-Pang Huang Bor‐Shouh Huang Chin‐Shang Ku

Seismometer

Sensor array

10.1007/s10950-012-9306-7

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Citations (15)

Vibrations of the TAIPEI 101 skyscraper caused by the 2011 Tohoku earthquake, Japan

Earth Planets and Space (2012)

Kou-Cheng Chen Jeen-Hwa Wang Bor‐Shouh Huang Chun-Chi Liu Win‐Gee Huang

The strong-motion recordings generated by the 11 March 2011, Tohoku, Japan earthquake recorded by the building seismic array in the TAIPEI 101, the second tallest building in the world, are more complicated than those at the free-field stations. Fundamental and higher-mode vibrations can be clearly seen on the spectra. The fundamental-mode frequency is about 0.15 Hz, which is the natural frequency of the skyscraper. Spectral ratios of ground accelerations at the building to those at a nearby borehole station increase from unity at the fifth floor underground to factors of 110 and 146, respectively, on the 74th and 90th floors above ground for the fundamental-mode vibrations. The frequency content of accelerograms, recorded on the fifth floor below ground from the great 2011 Tohoku-Oki earthquake, appears mainly in a frequency band of 0.015–0.1 Hz, leading to a fact that the ground motions did not cause high excitation in the TAIPEI 101 skyscraper.

Mode (computer interface)

Fundamental frequency

Frequency spectrum

Frequency band

10.5047/eps.2012.04.004

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Excitation of Short-Period Surface Waves in Taiwan by the Hyogo-ken Nanbu Earthquake of January 17, 1995.

Journal of Physics of the Earth (1996)

Bor‐Shouh Huang Ta‐Liang Teng Chun-Chi Liu Tzay‐Chyn Shin

Surface waves excited by the January 17, 1995 Hyogo-ken Nanbu earthquake recorded by the newly upgraded Taiwan short-period seismic network were used to perform a dispersion study. It is shown that for large and shallow earthquakes, recordings from short-period seismic networks can be effectively used for an intermediate period band (10 to 30 s) surface-wave analysis. The small station spacing of the Taiwan Seismic Network allows the application of array processing to extract high resolution phase velocities for both Love and Rayleigh waves, and to better handle the problem of surface-wave velocity determination for wave approach deviating from the great circle path. From the dispersion data so derived, a better definition of the Taiwan crustal structure is obtained. Since the general direction of the surface-wave arrival is nearly parallel to the major structural grain of Taiwan, this provides an opportunity to delineate the crustal lateral heterogeneities for different geological provinces in that region. The S-wave crustal structures from this surface-wave analysis are consistent with P-wave crustal structures from recent tomographic studies. Our results further indicate the absence of a root for the Central Range of Taiwan which rises to a height of 4, 000 m. This lack of a mountain root is also required by the recently completed Taiwan Bouguer anomaly map.

Rayleigh Wave

10.4294/jpe1952.44.419

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NOTES AND CORRESPONDENCE Observations Using the Taipei Basin Broadband Downhole Seismic Network: The 26 December 2006, Pingtung Earthquake Doublet, Taiwan

Win‐Gee Huang Bor‐Shouh Huang Kou-Cheng Chen Chun-Chi Liu Chin-Ren Lin

To monitor the fault activity in the Taipei area, a new broadband downhole seismic network comprised of three stations was established in the Taipei Basin over a period of three years, 2005 - 2007. The network geometry is a triangle with a station spacing of about 12 km covering the entire Taipei Basin. Each station has two holes of different depths containing modern instruments, including a low-gain broadband seismometer. The largest depth is 150 m. We report our first experience on the installation and operation of the broadband downhole seismic network in the Taipei Basin. Some representative records from the Pingtung earthquake doublet in December 2006 are shown here. Ground displacement during the Pingtung earthquake doublet can be recovered from the velocity records without the baseline corrections that are required for the acceleration records. Our network offers excellent data for accurate and effective characterization of seismic motion in the study area. Seismic data from this network will be shared with other research institutions in Taiwan and abroad for further research.

Seismometer

Sichuan basin

Baseline (sea)

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