  A quake model of bare strange stars for normal pulsar glitches is summarized.
Three mechanisms being responsible for developing elastic stress energy are
presented. It is suggested that other kinds of glitches (e.g, the frequency
glitch in KS 1947+300 and in AXP/SGRs) could represent the bulk-strain-induced
quakes. The apparent field increase of normal pulsars into ``magnetars'' could
be the result of stellar catastrophic shrinking when the elastic force raises
to a critical point.
