China News Service, Kunming, May 23 (Hu Yuanhang, Han Shuai, Nan Luojie) Qian Xiaodong, senior engineer of the Yunnan Provincial Earthquake Administration, and Li Tao, senior engineer of the Dali Prefecture Earthquake Administration, were interviewed by the media on the afternoon of the 23rd to interpret "5·21" Yangbi, Yunnan 6.4 There are abundant reasons for the aftershocks of a magnitude earthquake.

They said that the many fractures and intersections near the earthquake were one of the reasons.

According to their research, there are aftershocks and fluctuations in the back.

　　Since May 18, earthquakes of magnitude 4 in Yangbi have been active, and earthquakes of magnitude 4.2 and 4.4 occurred on May 18 and 19.

After the 4.2-magnitude earthquake occurred on May 21, the activity level escalated rapidly, with 5.6-magnitude and 6.4-magnitude earthquakes occurring at 21:21 and 48, respectively.

There were 8 more earthquakes of magnitude 4 and 2 earthquakes of magnitude 5.

　　According to two experts, there were 1585 earthquakes of magnitude 0 or above in this sequence from May 18 to May 23, including 40 earthquakes of magnitude 3 or higher, 24 earthquakes of magnitude 3 to 3.9, 12 earthquakes of magnitude 4 to 4.9, and 5 to 23. Level 5.9 3 times, 6-6.9 level 1 time.

　　The earthquake occurred on the Weixi-Qiaohou fault, which is a northwest strike-slip fault.

On the Cangshan mountain side near this fault, there is a famous deep fault parallel to it: the Honghe fault.

The Honghe Fault has many transverse faults, some of which even extend to the Weixi-Qiao post fault.

In addition, Weixi-Qiaohou fault also intersects with Longpan-Qiaohou fault near Qiaohou.

It can be seen that the numerous fractures and intersections near the earthquake are one of the reasons for the abundant aftershocks of the earthquake.

　　The two experts said that according to their attenuation study of the earthquake sequence, the two-hour attenuation coefficient p=1.01 for earthquakes of magnitude 2 or above, indicating that the sequence will not end immediately, aftershocks will attenuate for a period of time, and there will be aftershock undulations.

　　However, they also said that from the point of view of the stress level in the earthquake zone, some of the current stress parameters are gradually decreasing, indicating that the stress in the earthquake zone tends to decrease.

Some parameters for determining the type of earthquake have gradually become normal.

　　Why is the earthquake damage less severe?

The two experts explained that the lighter earthquake damage is related to geological structural factors on the one hand, and closely related to the quality of house construction on the other hand.

In recent years of poverty alleviation work, rural dilapidated houses have been completely eliminated, and rural houses have also been strengthened.

Although the magnitude of the earthquake was large, the collapse of residential buildings was less damaged than in the past.

　　Two experts suggested that houses that have been safety-identified can be moved in, and the public should increase their awareness of self-help and mutual help.

Don't panic when an earthquake occurs, avoid danger nearby, and don't listen to earthquake rumors.

　　It is reported that after the earthquake occurred, the China Earthquake Administration, the Earthquake Administration of Yunnan Province, the Earthquake Administration of Dali Prefecture and the Earthquake Administration of Yangbi County sent a total of 99 people to the Yangbi site for work. At present, the earthquake disaster investigation work is being carried out in an orderly manner. (Finish)