How It Works

The basic science behind earthquake warning has been known for over 100 years. Advances in technology have now made it practical and affordable.
The Science
Loma Prieta GGB 360 waveform
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P-waves and S-waves

Earthquake warning works by detecting the start of an earthquake. Every earthquake produces two type of seismic waves, called Primary Waves (P-waves) and Secondary Waves (S-waves). The P-waves travel fastest but carry little energy. Their presence indicates the start of an earthquake. By analyzing them, we can estimate how intense the following S-waves will be.

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Detecting Earthquakes
Example sensor array in the SF Bay Area
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Earthquake Sensors

Ground motion sensors are placed at carefully chosen locations near faults to detect earthquakes quickly enough that a warning can be given to everyone who will be affected by serious shaking; even those at the epicenter.

Our Technology
QuakeGuard Network overview
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Earthquake Warning system

Our system was specifically designed from the start to provide the best possible performance and reliability for earthquake warning.

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Applications
NetQG control model
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How To Apply Earthquake Warning

The value of earthquake warning is in how it is applied to protect people and property. We have over 15 years providing protection for our customers.

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