Relationships Among Magnitudes and Seismic Moment of Earthquakes in the Taiwan Region

Chen, Kou-Cheng; Huang, Win‐Gee

doi:10.3319/tao.2007.18.5.951(t)

Cited by 15 publications

(6 citation statements)

References 40 publications

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“…Skarlatoudis et al (2005) used moment magnitude, and not local magnitudes used for Japan, California, and Taiwan, to obtain the scaling shown in Figure 2 . We checked the conversion to the moment magnitude from the local magnitudes for California [ 12 ], Japan [ 13 , 14 , 15 ], and Taiwan [ 16 , 17 ], and confirmed that the similarity between the Δ r c - m correlation and the l a - M relation is valid, supporting our result.…”

Section: Resultssupporting

confidence: 73%

Nucleation and Cascade Features of Earthquake Mainshock Statistically Explored from Foreshock Seismicity

Kamogawa

Nanjo

Izutsu

et al. 2019

Entropy

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The relation between the size of an earthquake mainshock preparation zone and the magnitude of the forthcoming mainshock is different between nucleation and domino-like cascade models. The former model indicates that magnitude is predictable before an earthquake’s mainshock because the preparation zone is related to the rupture area. In contrast, the latter indicates that magnitude is substantially unpredictable because it is practically impossible to predict the size of final rupture, which likely consists of a sequence of smaller earthquakes. As this proposal is still controversial, we discuss both models statistically, comparing their spatial occurrence rates between foreshocks and aftershocks. Using earthquake catalogs from three regions, California, Japan, and Taiwan, we showed that the spatial occurrence rates of foreshocks and aftershocks displayed a similar behavior, although this feature did not vary between these regions. An interpretation of this result, which was based on statistical analyses, indicates that the nucleation model is dominant.

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Section: Resultssupporting

confidence: 73%

Nucleation and Cascade Features of Earthquake Mainshock Statistically Explored from Foreshock Seismicity

Kamogawa

Nanjo

Izutsu

et al. 2019

Entropy

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“…3). The relation deduced here is similar to that found by Chen et al (2007) even if the choice of the different variables in the regression is different. We finally propose a new equivalent moment magnitude M ′ W of 7.7 ± 0.2.…”

Section: Re‐evaluation Of the Moment Magnitudesupporting

confidence: 87%

“…Some authors have worked to establish relations between different local magnitudes used in Taiwan over the time ( M H , M D and M L ), body wave magnitude m b (1s), surface waves magnitudes M S and moment magnitude M W in the Taiwan area (Wang & Chiang 1987; Wang 1992; Chen et al 2007; Chen & Tsai 2008). Indeed, because the definition and procedure for determination of the magnitude differs from one catalogue to another depending on the period considered or on the data used in the calculation, we have decided to normalize all magnitudes with respect to the M W GCMT (Dziewonski et al 1981) moment magnitude as defined by Kanamori and Hanks (Kanamori 1977; Hanks & Kanamori 1979) through empirical relations (Kanamori & Anderson 1975; Kanamori 1983).…”

Section: Re‐evaluation Of the Moment Magnitudementioning

confidence: 99%

The largest instrumentally recorded earthquake in Taiwan: revised location and magnitude, and tectonic significance of the 1920 event

Theunissen¹,

Font

Lallemand³

et al. 2010

Geophysical Journal International

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International audienceThe Ryukyu subduction is known to generate very few earthquakes in its central segment contrarily to its two extremities. We focus in this study on the southernmost part of the Ryukyu subduction zone offshore east Taiwan. Our first task was to build a homogeneous earthquake catalogue for the period 1900–2007. The new catalogue provides homogenized M′W magnitudes and shows that several M′W≥ 7.0 earthquakes occurred offshore Hualien and Suao cities. We then focused on the 1920 June 5 earthquake (reported surface wave magnitude 8.1) previously located beneath the accretionary prism. The revised moment magnitude has been estimated in our catalogue at 7.7 ± 0.2. It is the biggest earthquake ever recorded in the Taiwan area but the fault that has produced this earthquake has not yet been identified with confidence. We relocated this event using regional phases (seismological bulletins archived at the Central Weather Bureau of Taiwan) about 50 km NNE and shallower of its former location, that is, within the Ryukyu Arc basement. According to earthquake bulletin information, revised magnitude, new hypocentral determination and known regional faults, we propose four potential active faults as candidates for the slip associated to this event: (1) the interplate seismogenic zone (ISZ), (2) an out-of-sequence thrust cutting through the forearc and branching on the ISZ, (3) a NS strike-slip fault cutting through the Ryukyu arc and (4) a N–S, westward dipping thrust fault, affecting the Philippine Sea Plate east of the Luzon Arc. The best compromise is to consider a rupture along the ISZ with a shallow nucleation possibly along a splay-fault followed by a downward and lateral propagation of the rupture that would explain the lack of significant seafloor motion and subsequent tsunami. We also estimate the maximum seismic coupling of the ISZ in the region east of Taiwan to about 0.4. In parallel, the evidences of aseismic slip occurring along the ISZ allow us to conclude that this region should only be affected by M < 8 earthquakes

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“…(2) Chen et al (2007) have given a relation between the seismic moment M 0 and CWBSN local magnitude M L log M 0 = (1.27 ± 0.06)M L + (17.23 ± 0.35).…”

Section: Discussionmentioning

confidence: 99%

Quantifying the seismicity on Taiwan

Chen

Turcotte

et al. 2013

Geophysical Journal International

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We quantify the seismicity on the island of Taiwan using the frequency-magnitude statistics of earthquakes since 1900. A break in Gutenberg-Richter scaling for large earthquakes in global seismicity has been observed, this break is also observed in our Taiwan study. The seismic data from the Central Weather Bureau Seismic Network are in good agreement with the Gutenberg-Richter relation taking b ≈ 1 when M < 7. For large earthquakes, M ≥ 7, the seismic data fit Gutenberg-Richter scaling with b ≈ 1.5. If the Gutenberg-Richter scaling for M < 7 earthquakes is extrapolated to larger earthquakes, we would expect a M > 8 earthquake in the study region about every 25 yr. However, our analysis shows a lower frequency of occurrence of large earthquakes so that the expected frequency of M > 8 earthquakes is about 200 yr. The level of seismicity for smaller earthquakes on Taiwan is about 12 times greater than in Southern California and the possibility of a M ≈ 9 earthquake north or south of Taiwan cannot be ruled out. In light of the Fukushima, Japan nuclear disaster, we also discuss the implications of our study for the three operating nuclear power plants on the coast of Taiwan.

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Relationships Among Magnitudes and Seismic Moment of Earthquakes in the Taiwan Region

Cited by 15 publications

References 40 publications

Nucleation and Cascade Features of Earthquake Mainshock Statistically Explored from Foreshock Seismicity

Nucleation and Cascade Features of Earthquake Mainshock Statistically Explored from Foreshock Seismicity

The largest instrumentally recorded earthquake in Taiwan: revised location and magnitude, and tectonic significance of the 1920 event

Quantifying the seismicity on Taiwan

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