What are the two major noises in Jiaxing?

At noon yesterday, 1 1: 38 and 12: 53, two loud bangs, "bang" and "bang", accompanied by a strong sense of earthquake, resounded throughout Jiaxing like thunder. After two loud noises, various speculations and opinions poured in. After receiving the call from the public, the hotline of the Party newspaper verified all kinds of speculations one by one, trying to solve this mystery. Two loud noises resounded through Jiaxing at noon yesterday 1 1: 38. There was a loud noise in the sky in he cheng, and the earth trembled. Xiao Zhang, who is watching TV at home, obviously feels the vibration of the glass on the house and windows. "What's the matter, is it thunder or earthquake?" Xiao Zhang muttered something and looked out of the window. Everything was all right. However, more than an hour later, 12: 53, the loud noise came again, and the earthquake was strong. This noise, like boiling water, boils among the general public. For a while, the office, QQ group and major forums were talking about these two fleeting loud noises. By collecting telephone and network information from citizens, the reporter found that these two loud noises almost resounded throughout Jiaxing. According to the collection of netizens, including more than 50 points such as Jiashan, Haining, Haiyan, Tongxiang and Pinghu at the city level, we can not only hear these two loud noises, but also feel the strong vibration that followed. "1 of" bang ",the glass in the room is shaking violently, and the electric car downstairs keeps screaming. At first I thought someone was decorating! Later, I went online and found that many people have encountered this situation. " A citizen said. Where did the noise come from? Speculation is endless. "Is it thunder?" "It won't be an earthquake, will it?" "I heard that a chemical plant exploded" ... Yesterday afternoon, in several forums in Jiaxing, as well as in the QQ group of journalists and colleagues, everyone made various speculations about these two sudden loud noises, including thunder, earthquake and the explosion of chemical plants and boiler plants. Some people even think that the vibration is caused by site construction or house decoration, and there are many versions. Among the numerous speculations about the noise source, after the analysis and elimination by netizens, three possibilities were finally screened out, namely, the explosion of boiler plant in Wangjiangjing Town, the explosion of chemical plant in Buyun Town, Da Qiao Town, and sonic explosion. "There are many planes in the sky this morning, and I think the possibility of sonic boom is relatively large. When the plane flies at supersonic speed in the air, the compressed air is broken down to produce shock waves, which eventually causes the violent fluctuation of pressure to form sonic booms. The sonic boom will also make two loud noises, just like thunder. " A Mr. Xu told his guess to the hotline of the party newspaper. According to an online poll, 50% of the participants agree with the statement of sonic boom. The answer is still a mystery. In response to all kinds of speculations on the Internet, the reporter made a verification to the relevant departments one by one. Our city 1 10, 120, 1 19 did not receive any distress calls related to these two loud noises. The Municipal Meteorological Bureau denied the "thunder theory" and made it clear that the noise had nothing to do with the weather. Seismological Bureau of the Municipal Science and Technology Bureau also said that there was no earthquake in Jiaxing area and even in Zhejiang Province yesterday. Regarding the "explosion theory" that people are highly concerned about, the reporter contacted Nanhu District Town and Xiuzhou District Wang Zhen successively, and both parties said that there was no explosion in the factory area under their jurisdiction. The staff of the Municipal Safety Supervision Bureau also said that they did not receive similar reports. Regarding the statement of sonic boom, Jiaxing military sources told reporters that at present, we don't know where these two loud noises came from, but we can basically rule out the possibility of sonic boom. Yesterday evening 17 15, the reporter learned from the municipal emergency office that the source of the loud noise is still unclear, and the relevant municipal departments are actively looking for the reasons. Link: When the plane flies at supersonic speed in the air, the nose or protruding part will form a shock wave. The dense sound waves emitted by the plane can't run to the front of the plane, but all pile up behind the fuselage to form a conical sound cone. When they spread outward, they interfere and influence each other, and then converge into a front shock wave including the nose and a rear shock wave with a random tail. These two kinds of shock waves reflect into people's ears, just like two thunderous loud noises. This noise is called "sonic boom".