Analysis of data collected from health management wearable terminals, how many people will occur due to earthquake shaking


On August 24, 2014 Japan time, an earthquake of magnitude 6.0 occurred in the southern part of the Napa group in California, USA. At the time of article writing, 120 people were injured, and in Napa County where wine is a special product, the wineries and bottles of the winery were damaged and the influence on the local industry is concerned. In CaliforniaAmong the earthquakes that occurred within the past 25 years, the largestIt is said that the scale of this earthquake will sell bracelet type wearable terminalsJawboneIt analyzes it from the sleep data at the time of earthquake occurrence and makes it public.

How did the Napa earthquake affect sleep?

Health management wearable type of type worn on the arm "UP"Jawbone, who is involved in the development and sales of the earthquake, has been developing from the epicenter" 0 to 25 mile (0 to about 40 km) "" 25 to 50 mile (about 40 to 80 km) "" 50 to 75 mile (about 80 to 120 km) "" 75 to 100 mile About 120 ~ 160km) "Analysis of the sleep data in the time zone before and after the earthquake of users living in the graph, open to the public.

The graph below shows the percentage of people who were awake among all the users on the vertical axis and the time on the horizontal axis, "0 to 25 mile (0 to about 40 km)" "25 to 50 mile (about 40 to 80 km)" "50 Users living in ~ 75 mile (about 80 ~ 120 km) and 75 ~ 100 mile (about 120 ~ 160 km) are indicated by broken lines of blue, green, purple and red, respectively. The proportion of people who have been awake since around 9 o'clock has been decreasing, but at 3:20 am when the earthquake occurred, users who live in Napa County / Sonoma Group / Vallejo / Berkeley closest to the epicenter will get up It shows that the proportion of people who rose from about 18% before the earthquake occurred to about 70% at a stretch, many people experienced tremors. Even if you look at other user's trends, many people have woken up depending on the distance from the epicenter.

However, in the graph of the user living in Sacramento / San Jose, it seems that there was no big change in the time of the occurrence of the earthquake and it was not enough to wake up. According to Jawbone, 45% of the people who were within 15 mile (about 25 km) from the epicenter and woke up by the earthquake could not sleep and went to the morning as it was.

On the other hand, in the earthquake that occurred this timeThe seismology laboratory of the University of California, BerkeleyUnder testEarthquake early warning systemHowever, it is also attracting attention that an alarm was issued 10 seconds before the earthquake occurred.

The seismology laboratory is publishing a movie where the earthquake early warning system sent an alarm 10 seconds before the earthquake occurred.

ShakeAlert at the UC Berkeley Seismo Lab for the M6 ​​American Canyon Earthquake on 24th Aug 2014 - YouTube

The red dot is the epicenter, and the "10" displayed on the left of the screen is the time it takes for the earthquake to reach the seismology laboratory of the house icon located slightly below the center of the screen. At this point the alarm "Baby" is ringing.

In the remaining 9 seconds the yellow ring, the first wave of the earthquake, appeared from the epicenter.

When the remaining 8 seconds have elapsed until the earthquake arrives, a red ring showing the second wave stronger than the first wave emerges from the epicenter.

Then 10 seconds after the alarm sounded, a strong shake reached the seismology laboratory.

Although the seismology laboratory will cooperate with other universities and intend to introduce an earthquake early warning system across the entire West Coast of the United States, it seems that considerable expenditure will be required for introduction. Richard Allen, director of the seismology laboratory, said, "Although it is necessary to introduce a lot of budget for the full-scale introduction of the early warning system, if it can be realized, while the earthquake arrives, ride the elevator that is in operation You can make enough time for a person to get off at the next floor or to decelerate a running train,I mentioned the importance of introducing an early warning system.

The early warning system is to install a sensor in the ground in areas where earthquakes occur frequently, detect the first seismic wave emitted from the epicenter, and send an alarm until a powerful second wave arrives, It has already been installed in Japan and Mexico. A time of a few seconds is enough time to stop driving a car or to jump out of the house and a full-scale introduction is awaited in order to suppress the damage of the earthquake as much as possible.

in Science, Posted by darkhorse_log