Ductile frames resist at least one-fourth of the total lateral force. Major earthquakes and their associated tsunamis constitute a risk to nuclear power plants on Taiwan. In the beginning, most applications involved These magnitudes were obtained from the global seismic network and are complete for Mw > 5.5. This was almost certainly a subduction zone earthquake associated with the oblique subduction of the Philippine Sea Plate beneath the Eurasian Plate. Seismic Zone Factor (Z), W (weak Asia and the Pacific: seismic hazard map. Also, the area of southern California is about twice as large as the area of Taiwan. China ‐ Taiwan (All) 4 China ‐ Tihwa 4 China ‐ Wuhan 2A Country/City Seismic Zone. For full access to this pdf, sign in to an existing account, or purchase an annual subscription. Haikou, the capital of the Hainan Province, and the Baotou of Inner Mongolia are also located in zone 6. 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. supported by four or more legs not attached to the structural system (i.e., Based on the discussion of global seismicity given above we correlate the ML > 7earthquakes from 1901 to 2011 with b = 1.5 and find that | $ \dot a$| = 1.15 × 1010 yr−1 as the solid line for ML > 7 in Fig. Thailand. Elementary and junior high school buildings have suffered their fair share of damage in these earthquakes. For public buildings such as schools, gymnasiums, As can be seen in Fig. Thus the earthquake catalogue established by CWB is a complete and consistent catalogue with ML greater than approximately 5. As a result of the extensive deformation, many earthquakes have occurred in the seismic areas north and east of Taiwan since 1900 as shown in Fig. The frequency–magnitude statistics of earthquakes in our test region are shown in Fig. In this study, we use the current catalogue covering the period 1900–2011, which is provided by the Central Weather Bureau (CWB). For warehouses or storage facilities, W is the total dead load and at Very high seismicity with dominant right‐lateral strike‐slip faulting is found in the back arc region behind the Ryukyu trench. (1), taking b = 0.9310 and | $ \dot a$| = 1.11 × 106 yr−1 which is shown as the solid line for 2 < ML < 7 and the dashed line for ML > 7 in Fig. Smaller events were disregarded on the grounds that they do not contribute significantly to total moment seismic release. Since large earthquakes in the global catalogue are dominated by deep subduction zone events this value is reasonable. Taking the accepted scaling between earthquake rupture area and magnitude (Kanamori & Anderson 1975) we find the global transition at Mw = 7.6 corresponds to a rupture area of 2110 km2 or a characteristic length if 46 km. ABSTRACT: In Taiwan, seismic isolation and energy dissipation technology has been extensively applied in new and retrofitted buildings and infrastructures against seismic attacks after the 1999 Chi-Chi Earthquake. During the study period the 82 mm yr−1 of compression were accommodated across central Taiwan. Wu et al. The island of Taiwan is a part of the complex boundary between the Eurasian Plate and the Philippine Sea Plate (Tsai et al.1977; Wu 1978; Shyu et al.2005). \end{equation}, \begin{equation} The Chinshan and Kuosheng plants are on the north coast (Hong & Guo 1995). We suggest that for larger earthquakes we can fit the available data with Gutenberg–Richter statistics taking b ≈ 1.5. Occupancy importance Factor. A detailed study of the seismicity north of Taiwan has been given by Ando et al. The direct subduction of the Eurasian Plate poses a severe tsunami risk, however the level of seismicity in this region is much lower. These two types of subduction zones … The difference for magnitudes less than ML = 5 can be attributed to catalogue incompleteness during the first half of the 20th century. W is the total dead load and the total weight of the contained water The continental crust of Taiwan is attached to the stable continental crust of the Eurasian Plate both to the north and west. For water towers and water tanks that have cross-lateral bracing and are We quantify the seismicity on the island of Taiwan using the frequency–magnitude statistics of earthquakes since 1900. The essential of this approach is to treat every historic event as a potential point source, then with the seismic … Shear walls or lateral braces function separately from the ductile Locations of earthquakes with ML≥ 5 since 1900 are shown. The ongoing seismic activity alerts the general public as well as the authorities to update national probabilistic seismic hazard maps and eventually the country’s seismic design code. Another consequence of the extensive deformation is deadly earthquakes on the island. Taiwan is in a seismically active zone, on the Pacific Ring of Fire, and at the western edge … However, on Taiwan the convergence of 82 mm yr−1 is accommodated in shallow compressional deformation. They also compared the different moment magnitudes from different sources and then adopted the moment magnitude Mw from the CMT catalogue as describing the earthquake size parameter. Yi-Hsuan Wu, Chien-Chih Chen, Donald L. Turcotte, John B. Rundle, Quantifying the seismicity on Taiwan, Geophysical Journal International, Volume 194, Issue 1, July 2013, Pages 465–469, https://doi.org/10.1093/gji/ggt101. 3. Implication of a statistical physics approach for earthquake hazard assessment and forecasting, Taiwan strong motion instrumentation program (TSMIP) and preliminary analysis of site effects in Taipei basin from strong motion data, Urban Disaster Mitigation: The Role of Engineering and Technology, Changes in frequency-size relationship from small to large earthquakes, Derivation of the complete Gutenberg-Richter magnitude-frequency relation using the principle of scale invariance, Great Taiwan Earthquake: The 1935 Central Taiwan Earthquake Disaster Report, A model for the motion of the Philippine Sea plate consistent with NUVEL-I and geological data, Some implications of Taiwan tectonic features from the data collected by the Central Weather Bureau Seismic Network, The calculation of local magnitude from the simulated Wood-Anderson seismograms of the short-period seismograms in the Taiwan area, An Overview of the 1999 Chi-Chi, Taiwan, Earthquake, Earthquake monitoring systems in Taiwan (in Chinese), Office of Inter-Ministry S&T Program for Earthquake and Active-fault Research, NSC, Neotectonic architecture of Taiwan and its implications for future large earthquakes, Rank-ordering statistics of extreme events: application to the distribution of large earthquakes, The size of the 2011 Tohoku earthquake need not have been a surprise, The largest instrumentally recorded earthquake in Taiwan: revised location and magnitude, and tectonic significance of the 1920 event, Tectonic implications of the seismicity in the Taiwan region, A statistical study of the Taiwan Telemetered Seismographic Network data during 1973–1979, Fractals and Chaos in Geology and Geophysics, Crust-mantle boundaries in the Taiwan-Luzon arc-continent collision system determined from local earthquake tomography and 1D models: implications for the mode of subduction polarity reversal, Illustrating 100 years of Taiwan seismicity, b values of shallow earthquakes in Taiwan, The Taiwan telemetered seismographic network, Damage and ground motion of the 26 December 2006 Pingtung earthquakes, Taiwan, Focal-mechanism determination in Taiwan by genetic algorithm, A geometric frequency-magnitude scaling transition: measuring b = 1.5 for large earthquakes, Velocity field of GPS stations in the Taiwan area. W = total dead load. Oxford University Press is a department of the University of Oxford. Near Taiwan this subduction is oblique with a predominant strike-slip component. the legs are attached to the ground). Direct evidence for this compressional deformation without subduction comes from the extensive GPS studies that have been carried out on Taiwan. Therefore, we utilize Gutenberg–Richter frequency–magnitude scaling to quantify the level of seismicity on Taiwan. systems, K = 0.80 provided that one of the following conditions is met: 1. It's an important basis for making key points on monitor and prevention areas about Chinese earthquakes.,, The locations of earthquakes in our test region since 1900 with ML≥ 5 are given in Fig. There are about 54earthquakefaultsexistingaroundthewholeis-land, and the occurrence of strong motion has a very high possibility in this region. 2. Earthquake intensity zones indicate where there is a 20% probability that degrees of intensity shown on the map will be exceeded in 50 years; tropical storm intensity zones indicate where there is a 10% probability of a storm of this intensity striking in the next 10 years. In the other words, the size of the earthquake depends on the total rupture area. In some cases the magnitudes are significantly different: for the Chi-Chi earthquake, they are ML = 7.3 and Mw = 7.6. Conference: 2017.10.30 – 2017.10.31 . We have considered the frequency–magnitude statistics of earthquakes in Taiwan since 1900. 2. The northernmost part of this belt extending from Yilan, links with the circum-Pacific seismic zone to the western Pacific Ocean seabed; the southern tip of the belt is almost connected to the Philippine seismic belt. Three major seismic events took place in 1845–1848, 1909–1917 (including 1916–1917 Nantou earthquake series) and 1999 (Chi-Chi earthquake, M L = 7.3, Fig. The locations of these two earthquakes are given in Fig. If b = 1 and ten M > 5 earthquakes are observed to occur each year, one magnitude M > 6 earthquake would be expected, on average, each year, and a magnitude M > 7 earthquake would be expected, on average, each 10-yr period. Comparing with the value 46 km for the global data, the characteristic length in Taiwan is much shorter. Kao and Rau relocated earthquake hypocenters using the Taiwan Seismic Network and revealed a double seismic zone beneath northeast Taiwan. Frames interact with shear walls or lateral braces structurally, and The zone 6(0.30g) is also high seismic hazard region. In our study, we utilize the local magnitude ML from the CWBSN catalogue based on the records from the Taiwan seismic networks. Research by JBR was supported by a grant from the US Department of Energy to UC Davis, grant number DE-FG02–04ER15568. Two major earthquakes that took place in these two areas are illustrated in Fig. In recent years, there has been a rapid development of industry in Taiwan with many highrise buildings and large structures. During the period 1973–1992 the seismic network-Taiwan Telemetered Seismographic Network (TTSN), was operated by the Institute of Earth Sciences (IES), Academia Sinica (Wang 1989; Wang & Shin 1998). Seismologists in Japan did not expect such a large earthquake with magnitude 9.0 because of lack of historical record. The convergence velocity from plate tectonic studies is 82 mm yr−1 (Seno et al.1993; Yu et al.1997). (2012). Taiwan, located along the circum-Pacific seismic zone where the Eurasian Plates and Philippines Sea Plates meet, sees frequent seismic activity. Based on the completeness of the catalogue and the excellent consistency of the Taiwan data with Gutenberg–Richter scaling, eq. \log M_0 = \frac{3}{2}M_{\rm w} + 16.1. (2012) have carried out that the rupture of a portion of the Ryukyu subduction zone with a rupture are of 8400 km2 (120 km × 70 km) may cause a M ≈ 8.7 earthquake in northeast Taiwan. For large earthquakes, M ≥ 7, the seismic data fit Gutenberg–Richter scaling with b ≈ 1.5. 1. INTRODUCTION Taiwan is located along the circum-Pacific seismic zone and has suffered great damage from a number of destructive earthquakes throughout its history. The 2-km-depth contour marks the transition from continental to oceanic crust. A detailed up-to-date study using worldwide data from the CMT catalogue has been given by Yoder et al. These studies have concentrated on global catalogues because they include large numbers of large earthquakes. In 1994, the CWB adopted the local magnitude with the attenuation function proposed by Shin (1993) to quantify earthquakes. For the earthquake data from 1901 to 2011 we see a significant deviation from the scaling given above for earthquakes with ML > 7. As government policy … To the northeast and southwest of Taiwan the seismicity is associated with subduction zones. the total lateral force is resisted by each component proportionally to the (1), are also included. The lithosphere has been delaminated and the convergence results in crustal thickening on a complex of thrust faults resulting in mountain building. We next compare the break in slope in Fig. A break in Gutenberg–Richter scaling for large earthquakes has been suggested by many authors, beginning with Rundle (1989). systems. 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 Keelung earthquake on 1910 April 12 is estimated to have had a magnitude ML = 7.8, it was a deep earthquake with an estimated depth of 200 km. T = the fundamental period of vibration. Another question of importance is whether a very large M ≈ 9 earthquake similar to the 2011 Tohoku (Japan) earthquake could occur on the subduction zones either north or south of Taiwan (Kao 1998). 1 that most of ML > 7 earthquakes took place along the subduction zone, that is, north and east of Taiwan and numerous ML < 7 earthquakes took place on the island. The large earthquakes with magnitude 8.0 in the subduction zone has been record misled many seismologists to only considered the M ≈ 8.0 earthquakes. (2011) collected and analysed the catalogues from 1900 to 2009 in different periods and transferred all the magnitudes with ML > 4.0 into the local magnitude used by current CWBSN. According 1. \end{equation}, \begin{equation} However, on Taiwan the convergence of 82 mm yr −1 is accommodated in shallow compressional deformation. (2012). The authors thank the Editor, Valerie Dennis, as well as the three anonymous reviewers for their constructive suggestions and comments. 2. Plate convergence is being taken up by crustal thickening within Taiwan on a complex of thrust faults resulting in mountain building in several north–south ranges. For this 20-yr period the number of earthquakes per year | $ \dot N_{\rm c}$| with magnitudes greater than ML are shown as solid circles in Fig. Of particular concern to the public is the risk to the three operating nuclear power plants on the coast of Taiwan. The cumulative numbers of earthquakes per year | $ \dot N_{\rm c}$| with magnitude greater than ML are given as a function of ML. 2 the Tohoku earthquake was not a surprise. (2011) has been updated to the current CWBSN catalogue. (1973, 1981) and Wang (1988) have studied the earthquake statistics in Taiwan. 1. containing natural gas and gasoline storage facilities. The upper plane seismicity starts below the interplate thrust zone and extends to a depth of 75 km at least. We have studied the statistics of the seismicity on Taiwan and in adjacent regions. (1992) have suggested that a transition from b ≈ 1 to 1.5 is due to smaller earthquakes being approximate equidimensional (depth ≈ length) whereas large earthquakes would have much greater lengths than depths (e.g. 12 earthquakes in the past 30 days. It is of interest to compare the level of seismicity in Taiwan with the level of seismicity in southern California. This belt faces the Pacific Ocean in an arc shape and also runs parallel to Taiwan, which extends 130 kilometers. For other regions of the country, C can be determined from, Table 1  However, in Seismic hazard map around Taiwan through a catalog-based deterministic approach Duruo Huang & Jui-Pin Wang The Hong Kong University of Science and Technology, Hong Kong SUMMARY: This study developed a national seismic hazard map around Taiwan through a deterministic manner. 2017 TAIWAN -JAPAN-NEW ZEALAND SEISMIC HAZARD ASSESSMENT MEETING Program and Abstracts. Z = seismic zone factor The lithosphere has been delaminated and the convergence results in crustal thickening on a complex of thrust faults resulting in mountain building. The Taiwan-Ryukyu subduction-collision complex: Folding of a viscoelastic slab and the double seismic zone Han-Chiang Chou,1,2 Ban-Yuan Kuo,3 Shu-Huei Hung,1 Ling-Yun Chiao,4 Dapeng Zhao,5 and Yih-Min Wu1 Received 5 May 2005; revised 14 October 2005; accepted 22 December 2005; published 20 April 2006. arc-and-trench systems respectively). Best-fitting correlations with Gutenberg–Richter scaling, eq. In terms of an extrapolation for Japan similar to that given in Fig. This situation is clearly obvious in central Taiwan, the Miaoli -Taichung region, Chyiayi -Tainan region and eastern longitudinal valley. police stations, hospitals, power and water-supply plants, and structures The convergence of 82 mm yr−1 between the Philippine Sea Plate and the Eurasian Plate is shown. Published by Oxford University Press on behalf of The Royal Astronomical Society. (2000) have carried out a similar study for southern California and concluded that about four M > 5 earthquakes occur per year. The more fault planes rupture the bigger the earthquake is. Magnitude: A logarithmic scale of earthquake size based on seismograph records. Shin (1993) used a normalized attenuation function considering the focal depth of earthquakes in the Taiwan area to simulate the Wood–Anderson seismogram with the CWBSN seismograms, the result shows that the local magnitude inferred from this attenuation function can present the properties of earthquakes in Taiwan. Per geographic zone (Z), this value is estimated and given in the seismic code of a country. Remove maintenance message (2011) report results from 531 stations for the period 1995–2005. East and north of Taiwan the Philippine Sea Plate is being subducted beneath the Eurasian Plate at the Ryukyu trench. Other earthquakes for which both magnitude values are available are in better agreement. This earthquake occurred in a zone of high seismicity and may have accommodated the right-lateral strike-slip motion between the Eurasian Plate and the Philippine Sea Plate. Both the crustal velocity structure and earthquake hypocenter distribution suggest that the subduction of the Philippine Sea plate along the Ryukyu trench extends to the east coast of Taiwan near about 23.5°N. Without the change in scaling a M > 8 earthquake would be expected about every 25 yr. With the change in scaling a M > 8 earthquake would be expected about every 200 yr. Date: Jan 2008; Source(s): European Commission Humanitarian Aid and Civil Protection DG (ECHO); United Nations Office for Disaster Risk Reduction - Regional Office for Asia and Pacific (UNDRR ROAP); United Nations Office for the Coordination of Humanitarian Affairs - Headquarters (OCHA) Original title: Earthquake intensity risk zones and … Contrary to central and southern Taiwan, northern Taiwan now shows a different tectonic setting from that of the main collision zone. Procedures for the evaluation of seismic … Delamination beneath Taiwan has been proposed by Ustaszewski et al. It is worth noting that the sizes of 38 large earthquakes with ML > 7.0 during 1900–1978 were re-estimated utilizing the moment magnitude Mw or surface wave Ms at the same time by Cheng et al. 1 these plants are adjacent to the subduction zone seismicity to the northeast. This complex deformation has generated mountain ranges on the island as high as 3952 m. Details of this complex zone of compression have been given by Shyu et al. The largest earthquake since 1900 was the offshore Hualien earthquake on 1920 June 5 with an estimated magnitude ML = 8.0 (Theunissen et al.2010). Tsai et al. National Cheng Kung University, Tainan, Taiwan . \end{equation}, Source mechanisms and tectonic significance of historical earthquakes along the Nankai trough, Japan, Very low frequency earthquakes along the Ryukyu subduction zone, Relationships among magnitudes and seismic moment of earthquakes in the Taiwan region, The construction of Taiwan earthquake catalogs (II), Present day kinematics of active mountain building in Taiwan from GPS observations during 1995–2005, Mapping seismic hazard in the central and eastern United States, Teleseismic b values; or, much ado about 1.0, Nonstationary Poisson model for earthquake occurrences, The potential for a great earthquake along the southernmost Ryukyu subduction zone, Theoretical basis of some empirical relations in seismology. This compares with similar break in frequency–magnitude statistics for global earthquakes at Mw = 7.6 which corresponds to an earthquake with a rupture area A ≈ 2100 km2 and a characteristic length A½ ≈ 46 km. earthquakes) Wadati-Benioff seismic zones occur south an d east of Taiwan (M anila-Luzon and Ryukyu . The geo-coding technique has been integrated in TREIF-ERA to improve location precision of insured residential houses 2016/8/15-17 Progress Report on Seismic Loss Estimation in Taiwan 7 . During the period 1900–1972 earthquakes were recorded locally on a few mechanical seismometers (Shin & Chang 2005) and on global networks. 32.1. Between these opposite-verging subduction systems, active . The seismicity used in this study is shown in cross sections by the dots in Figure 9; their section lines are shown in Figure 10. The authors would like to express gratitude to CWB for providing the quality earthquake catalogue. The distribution of seismic belt in China: Taiwan lies on the Circum-Pacific Seismic belt; Tibet, Xinjiang, Yunnan, Sichuan, Qinghai and other provinces lies on the Himalayas - Mediterranean Seismic belt, and the other provinces in the related earthquake belt. Seismic map of Taiwan (W = weak, M = moderate, S = strong) (1), we are confident that our use of the CWBSN catalogue is justified. 30 Oct. 2017 – 03 Nov. 2017 Quite good agreement is found over the magnitude range 2 < ML < 7. Taiwan has had: (M1.5 or greater) 0 earthquakes in the past 24 hours. For This map illustrates Taiwan's exposure to seismic, volcanic and tropical storm hazard. We conclude that these data are in good agreement with Gutenberg–Richter statistics taking b ≈ 1 as long as ML < 7. For ductile moment-resisting frames with shear walls or lateral bracing This seismic activity is interpreted as a result of plate convergence and back arc … the legs are attached to the ground) Results from the east coast show that it is part of the Philippine Sea Plate while results from the west coast show that it is part of the Eurasian Plate. Horizontal velocities are given relative to the stable Eurasian Plate. As a result, Taiwan has numerous mud volcanoes and hot springs . Frequency–magnitude statistics of earthquakes in our test region. © The Authors 2013. K = framing coefficient people. About Cookies, including instructions on how to turn off cookies if you wish to do so. Although we note that a break in scaling at magnitude M = 7 reduces the risk of large earthquakes the general level of seismic activity in Taiwan is 12 times greater than in southern California, so the risk remains significant. Our study of global seismicity utilized moment magnitude Mw from the CMT catalogue. It furthers the University's objective of excellence in research, scholarship, and education by publishing worldwide, This PDF is available to Subscribers Only. 2 the expected recurrence time of a M ≈ 9 earthquake would be about 3000 yr. A large subduction zone earthquake in this region is certainly expected, however the oblique subduction is likely to reduce the tsunami generation by such an earthquake. The work of CCC is supported by the National Science Council (ROC) and the Department of Earth Sciences, NCU (ROC). construction year, number of floors, seismic zone, model building type, etc. (2011). Sornette et al. However, based on the data given in Fig. For this reason, we fit the recent data to Gutenberg–Richter scaling, eq. We attribute this reduction to the absence of large faults in shallow crustal deformation on Taiwan. The records in zone III (Taichung-Changhua-Nantou) reveal higher levels of seismic activity; it is the second most important zone in western Taiwan in terms of total strain release. (e.g., tank completely filled). 1. component stillness. Earthquakes in recent decades have collapsed buildings and caused casualties and severe property loss. The transition at ML ≈ 7 corresponds to an earthquake rupture area A ≈ 253 km2 and a characteristic length A½ ≈ 16 km. We studied the detailed structure of the subducted Philippine Sea plate beneath northeast Taiwan where oblique subduction, regional collision, and back arc opening are all actively occurring. (2005). The deadliest earthquake on Taiwan with 3276 deaths was the Hsinchu-Taichung earthquake on 1935 April 20 with ML = 7.1 (Sen & Wu 1996). Field Trip: 2017.11.01 – 2017.11.03 . To the northeast and southwest of Taiwan the seismicity is associated with subduction zones. 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