Statics is the action of one body on another. A force is either a push or a pull. A force tends to move a body in the direction of its action. The action of a force is characterized by its magnitude, by the direction of its action, and by its point of application. Thus, force is a vector quantity, because its effect depends on the direction as well as on the magnitude of the action. Forces are classified as either contact or body forces. A contact force is produced by direct physical contact; an example is the force exerted on a
Earthquake duration magnitude in 2001 in the Bhuj area of northwestern India, the latest "empirically" derived equations for Md determinations are published: formula_1 ( Castello et al., 2007) formula_2 ( Mandal et al., 2004) Although conversions between empirically derived "sensitive" seismic parameters such as earthquake magnitude scales is mathematically cautioned as well as physically limited, some seismologists such as Brumbaugh have nevertheless attempted to produce a relationship linking ML to Md for a rather small sample of 17 events in Arizona: formula_3 Earthquake duration magnitude The concept of Earthquake Duration Magnitude - originally proposed by Bisztricsany in 1958 using surface waves only -