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Ramset powder-actuated tool. A powder-actuated tool (PAT, often generically called a Hilti gun or a Ramset gun after their manufacturing companies) is a type of nail gun used in construction and manufacturing to join materials to hard substrates such as steel and concrete.
[3]: 24 An earthquake with a magnitude of 5.5–6.0 is expected to occur every 50–100 years in the Texas Panhandle, while an earthquake with a magnitude greater than 6.0 is expected to occur every 300 years. [5] The strongest earthquake in this region was a magnitude 4.9 earthquake that occurred in 1925.
In 1941, the Hilti company Maschinenbau Hilti OHG was founded by Martin (1915–1997) and Eugen Hilti (1911–1964), [3] with the opening of a mechanical workshop in Schaan, Liechtenstein. Martin Hilti was trained in mechanical engineering and automotive design at the Wismar Engineering College and was 26 at the time of founding the company.
Research on the origin of seismic noise [1] indicates that the low frequency part of the spectrum (below 1 Hz) is principally due to natural causes, chiefly ocean waves.In particular the globally observed peak between 0.1 and 0.3 Hz is clearly associated with the interaction of water waves of nearly equal frequencies but probating in opposing directions.
Typical values of ground vibration particle velocity associated with vehicles passing over traffic calming road humps are in the range of 0.1 – 2 mm/s. Magnitudes of ground vibrations that are considered to be able to cause structural damage to buildings are above 10–20 mm/s.
The original "body-wave magnitude" – mB or m B (uppercase "B") – was developed by Gutenberg 1945c and Gutenberg & Richter 1956 [25] to overcome the distance and magnitude limitations of the M L scale inherent in the use of surface waves. mB is based on the P and S waves, measured over a longer period, and does not saturate until around M 8.