Seismicity characteristics of fault zones in Fujian area based on automatic seismic detection method
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摘要: 利用福建地震台网88个地震台站于2015年记录的10个月的连续波形数据，基于台网约束下的长短窗特征触发式震相检测的模板事件识别方法和匹配滤波自动检测方法，识别出模板事件919个，匹配滤波后重新识别和定位了共计2 243个地震事件，其中ML1.0以上地震1 991次，主要集中在ML1.0—1.5之间，这极大扩充了该震级范围内的福建地震台网目录。重新定位的地震震源深度分布在0—20 km之间，多数发生在10 km内的上地壳。沿长乐—诏安断裂带和永安—晋江断裂带，地震分布集中且表现出明显的分段活动性。在长乐—诏安断裂带上检测到较福建台网目录更多的地震，且地震活动性表现为西南段较强、东北段较弱，沿断裂带的震源深度分布由南向北逐渐变浅，与莫霍面深度的变化相一致；在与之共轭的永安—晋江断裂带上则北西段地震活动更为集中，而东南段地震活动稍显分散。重新识别与精定位后的地震与福建地区地壳水平形变南强北弱、东强西弱的特点相一致。Abstract: Driven by the tectonic loading of Taiwan and Taiwan Strait, there are several large Quaternary fracture zones in the Fujian area, with strong historical and current seismicity. We build a comprehensive seismic catalog with a new automatic workflow called PALM （phase picking, association, location, matched filter）, which combines STA/LTA and matched filter. PALM is applied to 10 month’s continuous data in 2015 of 88 stations from the Fujian Earthquake Agency. We recognized 919 template events and finally relocated 2 243 events after matching filter, among which 1 991 events with magnitude greater than ML1.0, and it greatly expanded the catalog from Fujian Earthquake Agency in the range of ML1.0−1.5. The depth of relocated earthquake events are distributed between 0 and 20 km, with most of them occurred within 10 km. The events are concentrated along Changle-Zhao’an fault zone and Yong’an-Jinjiang fault zone and showed obvious segmental activity. We detected more earthquakes than the catalog from Fujian Earthquake Agency, and the seismicity was stronger in the southwest section and weaker in the northeast section. The depth distribution along the fault zone became shallower from south to north, which was consistent with the change of Moho depth. Besides, we can see a highly clustered feature of seismicity at northwest section and slightly dispersed at southeast segment in Yong’an-Jinjiang fault zone, which forms a conjugate shape with Changle-Zhao’an fault zone. The repicked and relocated events in Fujian area was consistent with the characteristics of horizontal crustal deformation, which was stronger in south and east while weaker in north and west.
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图 1 福建地震台网台站、历史中强地震、2015年中小地震分布和区域断裂带分布图
F1：滨海断裂带；F2：长乐—诏安断裂带；F3：政和—海丰断裂带；F4：邵武—河源断裂带；F5：闽江断裂带；F6：永安—晋江断裂带；F7：上杭—云霄断裂带，下同
Figure 1. The distribution of seismic stations，history moderate and strong earthquakes ，mid-small earthquakes in 2015 and fault zones in Fujian area
F1：Binhai fault zone；F2：Changle-Zhao’an fault zone；F3：Zhenghe-Haifeng fault zone；F4：Shaowu-Heyuan fault zone； F5：Minjiang fault zone；F6：Yong’an-Jinjiang fault zone；F7：Shanghang-Yunxiao fault zone，the same below
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图 2 起始时间2015-01-27 T03:26:56 （a）和2015-04-19 T04:02:47 （b）下的不同台站垂直分量原始波形记录
Figure 2. Vertical component original waveforms in different stations started in 2015-01-27 T03:26:55 （a） and 2015-04-19 T04:02:47 （b）
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图 3 PAL模板事件垂向分量（蓝色）和检测到的地震事件的垂向分量（红色）
（a） 模板事件为2015年1月27日ML1.5地震，检测到的事件为2015年1月12日ML1.4地震； （b） 模板事件为2015年4月3日ML1.9地震，检测到的事件为2015年4月3日ML1.4地震； （c） 模板事件为2015年12月6日误识别事件，S震相识别错误
Figure 3. Examples for PAL template events in vertical component （blue lines） and detected events in vertical component （red lines）
（a） The template event is on 27 January 2015 ML1.5 and detected event is on 12 January 2015 ML1.4；（b） The template event is on 3 April 2015 ML1.9 and the detected event is on 3 April 2015 ML1.4；（c） Error template event on 6 December 2015 with inaccurate S phase
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图 4 基于PALM地震目录的地震事件分布与一维福建2015速度模型
（a） 地震事件水平分布图；（b） 震源深度分布沿纬度的投影；（c） 震源深度分布沿经度的投影；（d） 一维福建2015模型
Figure 4. Events distribution of PALM catalog and 1-D Fujian 2015 P wave velocity model
（a） Horizontal distribution of the events from PALM catalog；（b） Vertical distribution of the events along latitude；（c） Vertical distribution of the events along longitude；（d） 1-D Fujian 2015 P wave velocity model
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图 5 PALM地震目录（a）和福建地震台网编目目录（b）震级-频度分布及最小完备震级Mc对比
Figure 5. Frequency-magnitude distribution of PALM catalog （a） and Fujian Earthquake Agency catalog （b） and their complete magnitudes Mc
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