The China seismic intensity scale ( CSIS ) is a national standard in the People's Republic of China used to measure seismic intensity . Similar to EMS-92 on which CSIS drew reference, seismic impacts are classified into 12 degrees of intensity, or liedu ( Chinese : 烈度 ; pinyin : lièdù , literally "degrees of violence") in Roman numerals from I for insensible to XII for landscape reshaping.
7-550: The scale was initially formalized by the China Earthquake Administration ( CEA ) in 1980, therefore often referred to by its original title as " China Seismic Intensity Scale (1980) ". It was later revised, and adopted as a national standard, or Guobiao , series GB/T 17742-1999 by then National Quality and Technology Supervision Administration (now General Administration of Quality Supervision, Inspection, and Quarantine of P.R.C. , AQSIQ ) in 1999. The standard
14-579: A combination of descriptive qualifiers and a numeric evaluation process. The following is an unofficial translation of the Appendix I of GB/T 17742-1999. Notes about qualifiers: "very few" – <10%; "few" – 10% – 50%; "most" – 50% – 70%; "majority" – 70% – 90%; "commonly" – >90%. Historic local seismic liedu is an important reference in quake proofing existing and future buildings. The national standard Code for Seismic Design of Buildings (GB 500011-2001) published in 2001 and partially revised shortly after
21-559: The 2008 Sichuan earthquake includes a list of liedu that each building in designated cities is expected to resist. China Earthquake Administration The China Earthquake Administration ( CEA ; 中国地震局 ) is a public institution managed by the State Council at the deputy ministerial level in charge of national earthquake disaster reduction work. It is currently managed by the Ministry of Emergency Management . Some English text use
28-756: The National Science and Technology Commission ( 国家科学技术委员会 ) and Chinese Academy of Sciences after the 1966 Xingtai earthquakes . A Central Task Force of Earthquakes ( 中央地震工作小组 ) under the Central Committee of the Chinese Communist Party was created the day after a M7.4 earthquake struck Bohai Bay on July 18, 1969. In 1971, the State Council decided to create the National Earthquake Bureau ( CNEB ), predecessor to CEA, to replace
35-653: The "Central Task Force". The State Council initially delegated administration of the CNEB to the Chinese Academy of Sciences. CNEB became directly administrated by the State Councile in 1975. Following the recommendation from the CNEB, each province, autonomous regions and centrally administrated municipalities in PRC has established its own earthquake bureau since 1977. In 1985, these local bureaus were placed under dual leadership of
42-558: The name Chinese Seismic Bureau (CSB). In older text, it was also referred to by its former name, National Earthquake Bureau (NEB) or National Seismic Bureau (NSB). CEA presently has nine subordinate bureaus. As a country stricken by two of the world's ten most fatal earthquakes before the creation of CEA, China's first seismic monitoring stations were set up under the Chinese Academy of Sciences . A national Earthquake Affairs Office ( 地震办公室 )was created under joint administration of
49-401: Was set for revision not long before the 2008 Sichuan earthquake . Unlike the magnitude scales that objectively estimate the released seismic energy, liedu denotes how strongly an earthquake affects a specific place. It is determined by a combination of subjective evaluations (such as human senses and building damage) and objective kinetic measures. Building damage are further refined with
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