Tag Archives: Seismic

Smallest seismic sensor uses vibration spectral analysis

Graham Prophet @ eedesignnewseurope.com discuss about a new small seismic sensor from Omron:

Omron Electronic Components believes it has the world’s smallest class size seismic sensor, specifically designed to trigger the shutdown of potentially hazardous or easily damaged systems in the event of an earthquake.

Smallest seismic sensor uses vibration spectral analysis – [Link]

Measuring seismic activity using ProtoCentral OpenPressure

Seismic activity or “Vibrations of the earth” is measured using ProtoCentral’s OpenPressure 24-bit DAQ System.

A geophone is a magnetic device used to measure the Earth’s normal vibrations (some abnormal during events such as earthquakes). These movements are also present when there is a small explosion (commonly used for mining and exploration purposes).

Measuring seismic activity using ProtoCentral OpenPressure – [Link]

D7S Vibration Sensor From Omron

Omron announced a new seismic sensor and claims it’s the world’s smallest in size.

D7S sensor is a MEMS 3-axis acceleration sensor featuring OMRON’s unique SI value calculation algorithm, which has a high correlation with the seismic intensity scale that indicates the magnitude of an earthquake and provides higher-precision judgment of seismic intensity scales.

The below diagram describes how D7S works

D7S - Operation Chart
D7S – Operation Chart

The sensor has two open-drain outputs INT1 and INT2. INT1 goes active (low) when shutoff judgment condition and collapse detection condition are met (earthquake level 5 or higher), INT2 goes active (low) during earthquake calculations, offset acquisition and self-diagnostic processing.

I2C is used for communication with the sensor for settings and obtaining earthquake-related information.

D7S - Circuit Diagram
D7S – Circuit Diagram

D7S

D7S is a surface-mount compact module with 10.9 × 9.8 mm dimensions. I found the new sensor on Mouser and the price per unit is about $22 (USD) for 1-unit quantity order.

[Datasheet]

[Product Page]

Android app turns smartphones into a seismic network

20160215104808_MyShake-ScreenShot

Researchers at UC Berkeley (California) have developed an Android app that can detect vibrations from earthquakes using the standard sensors integrated into smartphones.

Android app turns smartphones into a seismic network – [Link]