Characteristics and Intensity Survey of the Lin'an M 4.2 Earthquake of Zhejiang Province
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摘要: 2017年4月12日，浙江省杭州市临安市发生4.2级地震，地震震中附近的潜川镇、河桥镇震感强烈，於潜镇、太阳镇、湍口镇等震感较为明显。在对震区地质构造、震源机制解资料分析的基础上，开展了烈度调查，并绘制了地震烈度图。本次地震震中烈度为Ⅴ度，面积22.6km2，烈度圈长轴方向北东向，与马金-乌镇断层走向一致。Abstract: On April 12, 2017, M 4.2 earthquake occurred in Lin'an, Hangzhou, Zhejiang Province. Near the epicenter area, people in Qianchuan town and Heqiao town felt quake strongly, and the tremor was also felt in Yuqian town, Taiyang town and Chuaikou town. On the basis of the analysis of the geological structure and the source mechanism of the earthquake, we conducted the survey and mapped the seismic intensity. The earthquake epicenter intensity of Ⅴ degrees, covers an area of 22.6km2 with the long axis in north-east direction, and is consistent with the strike of Majin-Wuzhen fault.
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图 2 东山畈附近调查照片及清绘剖面1
1：厚层灰色灰岩；2：逆断层及黄褐色粗碎裂岩
Figure 2. Fault profile #1 near Dongshanfan
图 3 东山畈附近断层照片及清绘剖面2
1：厚层灰色灰岩；2：逆断层及黄褐色粗碎裂岩；3：逆断层及灰绿色断层泥；4：ESR样点
Figure 3. Fault profile #2 near Dongshanfan
图 4 临安4.2级地震震源机制解参数
Figure 4. The focal mechanism solution of the Lin'an M 4.2 earthquake
图 8 震中区个别老旧房屋震害特征
（a）五里亭某户砖木结构房屋二楼窗口下墙皮掉落；（b）新桥头某户土木结构房屋墙体老裂缝加长、加宽；（c）鱼潭村某户砌体房屋老缝加长，瓷砖出现细小裂纹
Figure 8. Earthquake damage characteristics of some old houses at the epicenter area
表 1 临安4.2级地震震源机制解参数
Table 1. The parameters of focal mechanism solution of Lin'an M 4.2 earthquake
最佳双力偶解 节面Ⅰ/° 节面Ⅱ/° 走向 倾向 滑动角 走向 倾向 滑动角 298 87 -12 29 78 -177 应力轴 T轴/° B轴/° P轴/° 方位角 倾角 方位角 倾角 方位角 倾角 344 6 104 78 253 11 
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