Research on the common characteristics of the Yangbi earthquake with M5.1 in 2017 and M6.4 in 2021
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摘要: 云南漾濞2017年3月27日5.1级和2021年5月21日6.4级地震前地震活动性和地下流体观测资料存在一些异常共性特征。地震活动性异常共性特征有以下几个方面：云南M≥5.0地震平静异常；云南M4.0—4.9地震平静异常；云南M≥3.0地震低频次活动转为增强态势；滇西M≥4成条带分布；漾濞4级双震前震。地下流体观测资料水温、水汞、固体二氧化碳和水氡存在中短期异常共性特征，其中保山水汞，下关和洱源固体二氧化碳，下关、龙陵和腾冲水氡存在中短期同步性异常共性特征。Abstract: There are some common characteristics of anomalies in the seismicity and subsurface fluid observation materials before the M5.1 Earthquake on March 27, 2017, and the M6.4 earthquake in Yangbi, Yunan on May 21, 2021. The common characteristics of anomalies in seismicity are as follows: an anomaly in M≥5.0 Yunnan seismic quiescence; an anomaly in M 4.0—4.9 Yunnan seismic quiescence; the low-frequency activity of M≥3.0 Yunnan earthquakes changed to an enhancing trend; M≥4 earthquakes showed a stripping distribution in western Yunnan; M4 earthquakes occurred twice before M5.1 and M6.4 Yangbi earthquakes. The water temperature, water mercury, solid carbon dioxide, and water radon in the subsurface fluid observation materials have the common characteristics of short- and medium-term anomalies, among which the water mercury in Baoshan, solid carbon dioxide in Xiaguan and Eryuan, and water radon in Xiaguan, Longling and Tengchong have the common characteristics of short- and medium-term synchronous anomalies.
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Key words:
- M5.1 Yangbi /
- M6.4 Yangbi /
- seismicity /
- subsurface fluid /
- common characteristics.
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图 1 云南漾濞2017年5级和2021年6级地震及60 km内1900年以来M≥6级地震分布图
Figure 1. Distribution map of M5 earthquake in 2017 and M6 earthquake in 2021 in Yangbi , and M≥6 earthquakes since 1900 within 60 km
图 2 云南1986年以来M≥5级地震（a）年活动频次图和（b）时间间隔图
Figure 2. Annual activity frequency diagram and time interval diagram of M≥5 earthquakes since 1986 in Yunnan
图 3 云南1986年以来（a）4.0—4.9级地震时间间隔图和（b）M≥3级地震3个月活动频次图
Figure 3. (a) Time interval diagram of M4.0—4.9 earthquakes and (b) quarterly activity frequency diagram of M≥3 earthquakes since 1986 in Yunnan
图 5 洱源中层水温日均值图
Figure 5. Daily mean value chart of intermediate water temperature in Eryuan
图 6 下关和保山一井水汞日均值图
Figure 6. Daily mean value chart of water mercury in Xiaguan and Baoshan No.1 Well
表 1 云南漾濞2021年6级地震60 km范围内1900年以来M≥5级地震统计表
Table 1. Statistics of M6 earthquake in 2021 in Yangbi, Yunnan, and M≥5 earthquakes since 1900 within 60 km
序号 时间 北纬 东经 震级 1 1901-02-15 26°00' 100°06' 6.5 2 1902-08-00 26°18' 99°54' 5.5 3 1925-03-16 25°42' 100°24' 7.0 4 1925-04-03 25°36' 100°12' 5.5 5 1926-11-21 25°36' 100°18' 5.5 6 1943-03-31 25°42' 100°06' 5.5 7 1963-04-23 25°48' 99°30' 6.0 8 1975-09-04 25°54' 99°54' 5.0 9 1977-03-17 25°51' 99°41' 5.4 10 1977-03-17 25°51' 99°41' 5.2 11 1978-05-19 25°32' 100°18' 5.1 12 1982-12-28 25°34' 99°25' 5.4 13 1986-03-13 26°12' 100°11' 5.5 14 1986-12-27 25°21' 100°08' 5.0 15 1987-05-18 26°11' 100°11' 5.0 16 1989-02-10 25°59' 99°34' 5.0 17 2013-03-03 25°56' 99°47' 5.8 18 2013-04-17 25°54' 99°49' 5.3 19 2016-05-18 26°06' 99°32' 5.4 20 2016-05-18 26°06' 99°35' 5.0 21 2017-03-27 25°54' 99°48' 5.1 22 2021-05-21 25°38' 99°55' 5.6 23 2021-05-21 25°40' 99°52' 6.4 24 2021-05-21 25°40' 99°53' 5.0 25 2021-05-21 25°35' 99°58' 5.2 
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表 2 漾濞2017年5.1级和2021年6.4级前兆异常时间统计表
Table 2. Time statistics of precursor anomalies of M5.1 earthquake in 2017 and M6.4 earthquake in 2021 in Yangbi
序号 异常测项名称 异常达标时间 2017年漾濞5.1级前 2021年漾濞6.4级前 1 下关水汞日均值 2017-02-25 2020-07-19 2 保山一井水汞日均值 2016-09-06, 2016-10-08 2021-01-08 3 下关固体二氧化碳日均值一阶差分 2016-10-26 2021-01-04 4 洱源固体二氧化碳日均值一阶差分 2016-09-24 2021-01-21 5 下关水氡日均值变化速率 2016-10-18 2021-01-19 6 龙陵水氡日均值变化速率 2016-06-10 2021-01-09 7 腾冲叠水河水氡日均值变化速率 2016-06-06 2020-12-29
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