Space Weather

HF Propagation and Solar-Terrestrial Data Website
– Paul L Herrman
Sierra Vista, Arizona USA (DM41um)
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Thanks for funding in part by a COVID-19 Relief Recovery Grant from the Community Foundation for San Benito County and United Way of San Benito County.

Quake

Quake Report

Modified Mercalli Scale

The Modified Mercalli, or Mike-Mike scale is used to standardize and make more efficient the reporting of earthquake damage. Instead of reporting damage by using general descriptions like "major" or "minor" or "heavy", a Mike-Mike value is reported. This value is quick and simple to communicate over the air and equates to a standard level of damage as defined in the scale below.

Full Modified Mercalli Scale

MM8	Severe	Damage slight in specially designed structures; considerable damage in ordinary substantial buildings with partial collapse. Damage great
MM7	Very strong	Damage negligible in buildings of good design & construction; slight to moderate in well-built ordinary structures; considerable damage
MM6	Strong	Felt by all, many frightened. Some heavy furniture moved; a few instances of fallen plaster. Damage slight.
MM5	Moderate	Felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop.
MM4	Light	Felt indoors by many, outdoors by few during the day. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing cars rocked noticeably.
MM3	Weak	Felt quite noticeably by persons indoors, especially on upper floors of buildings. Vibrations similar to the passing of a truck.
MM2	Weak	Felt only by few at rest, especially on upper floors of buildings.
MM1	Not felt	Not felt except by very few under especially favorable conditions.

An example of a proper response is: "(your-call-sign), Mike-Mike-4, Tres Pinos"

		Sea Otter Classic Foundation