The Taiwan Telemetered Seismographic Network

Wang, Jeen Hwa

doi:10.1016/0031-9201(89)90090-3

Cited by 42 publications

(31 citation statements)

References 4 publications

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“…An empirical law suitable for the Taiwan region is adopted for correcting the effects of hypocentral distances (Shin 1993). We retain only shallow earthquakes (0 -70 km) within the defined study region for the determination of the GR (Wang 1989). We thus deem that the CWB catalogue is nearly complete beginning in 1979 and only the time period between 1979 and 2007 is analyzed.…”

Section: Frequency-magnitude Relationshipmentioning

confidence: 99%

Earthquake Probabilities and Energy Characteristics of Seismicity Offshore Southwest Taiwan

Chen¹,

Newman

Wu³

et al. 2008

Terr. Atmos. Ocean. Sci.

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We characterize fault geometries for moderate and large earthquakes in and offshore southwest (SW) Taiwan. Stress orientation estimates suggest that the first shock of the Pingtung earthquake may be characterized by slab flexure. A region of predominately normal-faulting earthquakes is also defined. Using the maximum-likelihood Gutenberg-Richter relation, we find that the repeat times for magnitude, M 6.5 and M 7.0 earthquakes are approximately 30 and 80 years, respectively. By assuming a Gaussian probability distribution with a standard deviation of 0.4 the recurrence time, we estimate a 50% probability of an M 6.5 earthquake recurring in the next 30 years, while only a 20% probability of an M 7.0 in the next 50 years. To test the empirical relation that is currently being used to convert M L to seismic moment (M 0 ), we test the well-defined energy to moment ratio (E/M 0 ) for the region. We additionally utilize this method to identify the lack of slow-source earthquakes in several recent offshore events in Taiwan.

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Section: Frequency-magnitude Relationshipmentioning

confidence: 99%

Earthquake Probabilities and Energy Characteristics of Seismicity Offshore Southwest Taiwan

Chen¹,

Newman

Wu³

et al. 2008

Terr. Atmos. Ocean. Sci.

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“…The earthquake magnitude used by the TTSN was the duration magnitude. Wang (1989a) described this network in detail. Since 1991, old seismic network stations of the Central Weather Bureau (CWB) have been upgraded and many new stations were added to form a new CWB Seismic Network (CWBSN).…”

Section: Introductionmentioning

confidence: 99%

The Frequency Distribution of Inter-Event Times of M ≥ 3 Earthquakes in the Taipei Metropolitan Area: 1973 - 2010

Chen¹,

Lee²,

Huang³

et al. 2012

Terr. Atmos. Ocean. Sci.

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M ≥ 3 earthquakes which occurred in the Taipei Metropolitan Area from 1973 through 2010 are used to study seismicity of the area. First, the epicentral distribution, depth distribution, and temporal sequences of earthquake magnitudes are described. The earthquakes can be divided into two groups: one for shallow events with focal depths ranging 0 -40 km and the other with focal depths deeper than 60 km. Shallow earthquakes are mainly located in the depth range from 0 -10 km north of 25.1°N, and down to 35 km for those south of 25.1°N. Deep events are located in the subduction zone, with a dip angle of about 70°. Three statistical models, the gamma, power-law, and exponential functions, are applied to describe the single frequency distribution of inter-occurrence times between two consecutive events for both shallow and deep earthquakes. Numerical tests suggest that the most appropriate time interval for counting the frequency of events for statistical analysis is 10 days. Results show that among the three functions, the power-law function is the most appropriate for describing the data points. While the exponential function is the least appropriate to describe the observations, thus, the time series of earthquakes in consideration are not Poissonian. The gamma function is less and more appropriate to describe the observations than the power-law function and the exponential function, respectively. The scaling exponent of the power-law function decreases linearly with an increasingly lower-bound magnitude. The slope value of the regression equation is smaller for shallow earthquakes than for deep events. Meanwhile, the power-law function cannot work when the lower-bound magnitude is 4.2 for shallow earthquakes and 4.3 for deep events.

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“…First, good S-wave travel times are difficult to measure because the S-wave onsets are often obscured by the P-wave code. Second, in Taiwan, before the newly upgraded seismic network, only vertical-component seismometers were deployed (Wang, 1989), and thus the SH energy was poorly observed. Third, even in experiments with controlled sources, S waves are not well excited, and their measurements are not nearly as accurate as those from P waves.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 1996

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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.

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The Taiwan Telemetered Seismographic Network

Cited by 42 publications

References 4 publications

Earthquake Probabilities and Energy Characteristics of Seismicity Offshore Southwest Taiwan

Earthquake Probabilities and Energy Characteristics of Seismicity Offshore Southwest Taiwan

The Frequency Distribution of Inter-Event Times of M ≥ 3 Earthquakes in the Taipei Metropolitan Area: 1973 - 2010

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

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