Early Earthquake Warning System

An Earthquake is an unexpected movement of the Earth’s surface.
It occurs when two parts of the Earth’s surface move relative to each other along a fault line. Due to tectonic forces ,the surface of the Earth starts vibrating and tremors are felt.
The point of origin of the Earthquake is known as FOCUS and the point directly above it on the Earth’s surface is known as EPICENTRE.


An earthquake warning system is a system of accelerometers, communication, computers, and alarms that is devised for regional notification of a substantial earthquake while it is in progress.

As of 2013, Japan is the only country with a comprehensive nationwide earthquake early warning system. Other countries and regions have limited deployment of earthquake warning systems, including Taiwan and Mexico.

Zone – II: This is said to be the least active seismic zone. Parts of Maharashtra and Uttar Pradesh fall under this zone

Zone – III: It is included in the moderate seismic zone. Andaman and Nicobar Islands, parts of Kashmir, Western Himalayas fall under this zone.

Zone – IV: This is considered to be the high seismic zone. Delhi, Jammu and Kashmir fall under this zone

Zone – V: It is the highest seismic zone. The region of Kashmir, the western and central Himalayas, North Bihar, the North-East Indian region and the Rann of Kutch fall in this zone.

earthquakeWhy Do We Need It-

The Indian subcontinent has a history of earthquakes. The reason for the high frequency and intensity of earthquakes is the Indian plate driving into Asia at a rate of approximately 49 mm/year.

India also has a long list of earthquakes. The Seismic Zone V and IV are most vulnerable to earthquakes, the following are some of the major  Earthquakes in India:-

21st March, 2014Andaman & Nicobar6.7 and 5.3
1st May, 2013Jammu and Kashmir5.8
30th April, 2012Andaman and Nicobar Islands6.2
5th March, 2012New Delhi5.2
8th September, 2011Gangtok, Sikkim6.9
8th October, 2005Kashmir7.6
26th Decemeber, 2004India, Srilanka and Maldives9.1
26th January, 2001Gujarat7.6
  • Detects earliest onset of an earthquake. Available from
  • Eliminates false triggers from environmental vibrations.
  • Redundant dual sensors.
  • Advanced DSP (digital signal processing) algorithms.
  • Triggers audible alert when an earthquake has been detected. Available from
  • Automatically controls systems through 1 to 32 contact closures, expandable serial control bus, and Ethernet.
  • Supports remote monitoring, diagnostics, and configuration through network interface.
  • No false alarms as it works on principle of 2/3 voting that means when 2 sensors out of 3 votes for earthquake then only the alarm triggers.
  • Manual and/or network control for user activation in response to non-seismic crisis, supporting all-hazards damage mitigation programs.
  • Reset and test switches are integrated in 1 box, mount anywhere. Optional extra switches.

6. Continuous Battery Backup

  • 12V battery backup provides a minimum of 1 day of operation.

7. Diagnostics

  • Extensive internal diagnostics that check all aspects of the unit’s operation.
  • Auto-recovery in case of failure.

8. IntelliQuake Valve Options

  • Control of actuated valves for gas shutoff and other applications.

9. Installation, Warranty and Service Includes 1 year parts/labor warranty.

  1. Pressure wave or Pwave: It is the first to reach. It is 1.7 times faster than the s wave or Shear wave. In this, the particles move back and forth along the direction of the wave.
  2. Shear wave or S wave: It reaches moments after the P wave and is more destructive. In this, the particles move at right angles along the direction of propagation of the wave.
  3. L wave or long wave: It is the superposition of two waves and causes maximum destruction. It travels like a sea wave.
  • It works by detecting these P-waves and triggering alarms and other response systems before the damaging waves arrive.
  • The warning time is about 1 second for every 5 miles of distance from the earthquake’s focus.

How EEW Works

  • Seismic Warning’s P-wave technology is unique in eliminating false positives
  • Filtering both man-made vibrations and small earthquakes (which should be ignored) while triggering on large quakes.
  • Patented DSP algorithms used in EEW isolate the signature waveforms of a seismic event that has just occurred
  • To avoid false alarms and convey precise EEW information to users, PX-01 was created. Supporting Modbus TCP/IP Protocol,this main control unit is designed and developed for on-site EEWS.
  • With a PX-01, three Palert, and an FTE-D04 seismic warning device or a “plug-n-play” LF-01 Lantern Fish, San Lien On-site Earthquake Early Warning System is formed.

The system features:

  • 2-out-of-3 EEW algorithm determination.
  • Connecting up to 5 x Palert and forwarding streaming to 100 clients at most.
  • Provision of event and waveform recording.
  • Providing minimum 3 relay outputs for multiple purposes.
  • Voice alerts for regional & on-site EEW messages for S-wave
  • Countdown and estimated maximum intensity broadcasting.
  • Modbus TCP/IP emergency door exit control.
  • Supporting EEW messages outputting to 5 x FTE-D04 and 5x electronic marquees simultaneously.
  • Extension application of tipping bucket rain gauge
  • New extension application: LF-01 “Lantern Fish”
  • Plug-n-go desktop Quake Alarm with CO2 & RH/T functions (UDP broadcasting supported).
  • San Lien (PX-01) On-site EEWS is an ideal system to execute emergency shutdown or evacuation for semiconductor manufacturers, chemical plants, gas line valves, schools, hotels, publics or places where people gather.
  • With the certified TAF lab calibration report for Palert,this system provides accurate, instant and reliable EEW to fit into various kinds of applications.
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A system example of on-site early warning system at
Taiwan Taichung National Museum of Natural Science

  • With assistance from Prof. Yih-min Wu and his remarkable team, Our Principals at Taiwan had accomplished a two-week training program to personnel of IITR, one of the best earthquake engineering department in Asia, to supply 100 P Sensors including Linux server programs and Earthworm modules for the first time ever.
  • The milestone project began in January, 2013 by an Indo-Taiwan workshop taking place in New Delhi and Roorkee, India, at which renowned scholars and experts of seismology from government and academies of both sides attended to discuss the possibility to establish the first EEWS in India.

IIT Roorkee Testimonial for using our product for India first EEW set up