On 26 march, at 0121 hours, the chinese seismic network officially determined that a 4. 2 magnitude earthquake had occurred in yongqing county, the city of hebei province, at a depth of 20 km. 7. 5 seconds after the earthquake, chinaEarthquake warningThe network has issued early warning messages to nearly 1,000 terminals, and a national earthquake warning micro-intelligence programme has been sent to nearly 300,000 people. No casualties were reported during the earthquake。
The interactive survey entitled “did your mobile phone receive an earthquake warning”, launched by the people's daily microblogging company, involved the active participation of netizens。
Why is there an earthquake alert on the phone? How was it sent out and received? What are we going to do when we get the information? The journalist spoke。
How did the message go
5-10 seconds to cell phone users
Zhang xianxing, director of the seismic seismic network, hebei, described the technique of warning several seconds to dozens of seconds before the destructive seismic waves reach the target area, using variations in the speed of transmission between electromagnetic and seismic waves and between seismic vertical and seismic waves after the earthquake. Earthquake warning should be used primarily to provide the public with emergency shock alerts (staff-intensive site start-up contingency plans, high iron emergency brakes), to provide security for lifeline work (automatic gas pipeline shut-down, safe stoppage of nuclear power plants), to protect critical equipment (precision instruments, emergency stoppage of production lines, etc.). While early warning of earthquakes can send emergency warning messages, there are limitations at this stage, such as the presence of blind areas, misreporting, underreporting and the limited impact of mitigation。
“as of now, the distribution channels for earthquake warning information in hebei province include seismic warning terminals, micro-intelligence programs, iptv network television, and cellular radio time app clients, which can provide earthquake warning information to residents in hebei province. Mobile phones have become an important means of receiving early warning messages.” zhang is happy to say。
How did earthquake warning information go before the end of a cell phone was seen
Zhang xian xing explained that the earthquakeEarly warning systemsIt consists mainly of an early warning desk network, an early warning processing system, an information dissemination system and an early warning distribution terminal。
“in the aftermath of an earthquake, the high-density seismic warning stations network records seismic waves and transmits seismic wave-form data to the early warning processing system; the early warning processing system processes wave-form data to produce early warning information for earthquakes in seconds and sends it to the information dissemination system; and the information dissemination system receives early warning information and determines the main parameters of the earthquake. Upon confirmation of compliance with the conditions for publication of early warning information, the early warning information is forwarded to the early warning terminals of the respective distribution channels; ultimately, the early warning terminals receive early warning information and alert the public.” zhang xian xing said that, in general, 5-10 seconds after the earthquake in hebei province, users received early warning information about the earthquake。
How to receive information on a cell phone
Some cell phones are built into the early warning function via the micro-intelligence applet and ap
Zhang xian xing explained that currently, mobile phone access to earthquake warning information is micro-trusted and mobile phone alert app, and that some mobile phone manufacturers also have seismic warning functions. Users can receive earthquake warning information in either way by opening the cell phone function。
In the case of micro-intelligence, for example, when setting up an earthquake warning system, users search for a “china earthquake network” or a “earthquake alert”, enter a “china earthquake station network” program, click “to open an earthquake warning system” and allow “earthquake alerts” and “access to a location” and start an earthquake warning service when they have successfully added a focus。
“seismic early warning information dissemination and end-response adopt a differentiated strategy. Earthquake early warning information, published by the china seismic early warning network, uses a web-wide delivery mechanism, and any terminal equipment with seismic early warning capabilities in the target area will receive early warning information in real time. The receiving terminal will provide a different level of alert based on the predicted seismic intensity of the location.” zhang is happy to say。
During the earthquake, a number of beijing citizens received early warning information through the beijing earthquake micro-intelligence program. When will earthquake alerts be received? The vice-president of beijing earthquake station, maszheng, used the “beijing earthquake station” micro-intelligence program to launch a strategy for the dissemination of seismic events at the level of 4. 0 or above the level of 5 degrees or more in the vicinity of kyoutin and in other regions. In terms of response strategies, when the focus is estimated to be less than 2 degrees, early warning information is shown only on the front page of the small program, without warning to users; when the user's concern is estimated to be greater than or equal to 2 degrees, receiving real-time early warning messages through service announcements; and when the focus is projected to be greater than or equal to 5 degrees, even if the cell phone is out of the screen, the warning message is mandatory, with an andre system user receiving a barbed-screen notification。
The beijing seismic platform applet sends earthquake warning information based on user concerns. The user allows the location of a small program when default attention is given to opening a micro-mail alert. It also allows users to set different areas of concern, adding the location of relatives, destinations, etc. As a second area of concern, and sends early warning information on earthquakes based on the actual situation in the area of concern。
Why can't some people receive early warning messages? Concerned that the delivery threshold has not been met, or that mobile phone settings are in question, there is a need to set up micro-notifications and set service notifications。
How to respond to information received
Choose different ways of avoiding risk depending on the time of warning
To be able to identify early warning information, seismic warning information is divided into four levels: red, orange, yellow and blue. “if you receive early warning information from yellow and blue earthquakes that the impact of the earthquake on you is small, do not panic at this time and be careful where there may be a high-altitude crash. If an orange and red warning message is received that an earthquake may cause damage to your location, it will require a number of avoidance measures, particularly red warning messages, which must be avoided quickly.” zhang is happy to say。
In the case of lower floors, where sufficient warning time is available, the first evacuation is to the outside safety zone. It is important to stay away from high-risk buildings, chimneys, billboards, bridges, etc. During out-of-door evacuation or avoidance, as the earthquake is likely to cause high-altitude crashes and damage. It is also necessary to stay away from electrical facilities such as utility poles and transformers, and the damage caused by the power leak is worse than the earthquake itself。
“if the floor is too high or the time is too tight to leave the room, it is important that it is first taken up by a cushion or pillow to protect the head. Lower the centre of gravity, hide in a small, heavy wall, and hold firmly on to solid objects to prevent shaking until after the shock is over. When time is available, power, gas can also be turned off to prevent leakage and explosions. Remember not to climb windows, not to jump off buildings, not to ride elevators." zhang lucky said。
According to the head of the beijing earthquake bureau, the method of protection was different depending on the time of warning. The warning time is 3 seconds, when the interior is protected by solid solids (e. G., under the table, by the bed, etc.) and outside the building; 5 seconds, when the flats are evacuated to the open area; 10 seconds, when the first or second floors of the building are evacuated outside the building; 15 seconds, when the low floors are evacuated outside the building, when the upper floors are evacuated. In particular, high-level indoor households are required to shut down gas, protect their heads, hide under solids or in small open spaces, have heavy wall space, stay low, cover, hold firm solids, do not use elevators, and stay away from mirrors, glass, etc。
I'm a reporter
