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1950 2000 2050 2100 2150 2200Seconds after 10/3/09 8:00 UTC

Pa

Sakurajima Eruption Measured 1000 km Away at Nuclear Test Monitoring Site

Photo Courtesy of Martin Rietze

Seattle Gas Explosion – March 10, 2016

Paroscientific, Inc.Paroscientific, Inc.

Atmospheric Tides at Harvard VaultAtmospheric Tides at Harvard VaultAndreas Muschinski analyzed a 15-day long series of pressure data acquired with a Paroscientific Barometer at the Harvard Vault.

The solar atmospheric tides can be clearly seen in the frequencyspectrum of the pressure fluctuations.

The observed amplitudes are:12 hour tide amplitude--100 Pa 8 hour tide amplitude--40 Pa6 hour tide amplitude-----30 Pa 4 hour tide amplitude----8 Pa

We thank Robert Busby and John Collins of IRIS for conducting the tests and providing the data, Harvard University for use of their facility, equipment and seismic data, and Quanterra, Inc. for their collection, integration and installation assistance.

Andreas Muschinski analyzed a 15-day long series of pressure data acquired with a Paroscientific Barometer at the Harvard Vault.

The solar atmospheric tides can be clearly seen in the frequencyspectrum of the pressure fluctuations.

The observed amplitudes are:12 hour tide amplitude--100 Pa 8 hour tide amplitude--40 Pa6 hour tide amplitude-----30 Pa 4 hour tide amplitude----8 Pa

We thank Robert Busby and John Collins of IRIS for conducting the tests and providing the data, Harvard University for use of their facility, equipment and seismic data, and Quanterra, Inc. for their collection, integration and installation assistance.

Paroscientific, Inc.Paroscientific, Inc.

Atmospheric Tides at Harvard VaultAtmospheric Tides at Harvard Vault

Paroscientific, Inc.Paroscientific, Inc.

Atmospheric Tides at Harvard VaultAtmospheric Tides at Harvard Vault

Paroscientific, Inc.Paroscientific, Inc.

We thank David Simpson, Tim Ahern, Rick Benson, Rick Aster, and their colleagues at IRIS, GSN, PASSCAL, and DMC for providing the data and format analysis techniques