At 2146 hours on 22 December, a magnitude 4.2 earthquake occurred at Tianning District, Changzhou, Jiangsu (31.75 n, 120.00 e) , at a depth of 10 km. 

      At the Kunshan Development Zone, the quake was so strong that the lights in the house shook violently for several seconds. 

     After the earthquake, Weibo Circle of Friends Fried Pot, there are many Nanjing, Suzhou, Wuxi Netizens said received in advance of the earthquake warning information, earthquake early warning is how to do it? I have to mention the advanced Earthquake warning system. The Earthquake warning system is a facility that provides early warning of earthquakes, also known as a seismic exploration facility. Speaking of seismic exploration devices, linear motors have already been used in practice. It is reported that in recent years, some departments are studying a kind of shallow shear wave seismic exploration source device based on linear motors, and a connecting module is fixed at the front of the mounting module, the Linear Motor stator is fixed on the concave surface in front of the vertical plate stator connecting plate of the connecting module, and the movable element is fixed on the back of the movable slider connecting plate of the heavy hammer module, and the movable movable slider connecting plate is fixed on four linear guide rail slides, the linear guide slide is mounted on the front of the two linear guide rails, the two linear guide rails are fixed on the convex surfaces at the two sides of the front of the vertical plate stator connecting plate of the connecting module, and the heavy hammer is fixed on the front of the movable slider connecting plate, the bulkhead is directly below the weight, and the control box is on the left side of the whole device.

     Kunshan Tongmao Electronics Co. , Ltd. . Deep tillage linear motor field more than 10 years, Tongmao linear motor using European and American technical standards and processing technology, including no core U Slot and core plate two categories, welcome to pay more attention. 

     The article was originally written by www.tmmotion.com in Kunshan, China. Please quote the source.