Crustal dilatancy and geomagnetic variations of short period.

Semiannual Variation of Geomagnetic Disturbance and Its Modulation of Shorter Period Variations

By making use of the techniques of power spectrum analysis and simple linear filtering procedures, it is shown that the amplitude of the 27-day variation of the geomagnetic disturbance index Ci is subject to a significant semiannual modulation. It is also shown that there is no amplitude modulation of this component with other periods such as the annual or 11-year period. The semiannual amplitu...

The geomagnetic field variations and earthquake activity

patterns and variations in native and non-native interlanguage pragmatic rating: effects of rater training, intercultural proficiency, and self-assessment

although there are studies on pragmatic assessment, to date, literature has been almost silent about native and non-native english raters’ criteria for the assessment of efl learners’ pragmatic performance. focusing on this topic, this study pursued four purposes. the first one was to find criteria for rating the speech acts of apology and refusal in l2 by native and non-native english teachers...

Fractal Analysis for Geomagnetic Secular Variations

Short Note Temporal Variations in Crustal Scattering Structure near Parkfield, California, Using Receiver Functions

We investigate temporal variations in teleseismic receiver functions using 11 yr of data at station PKD near Parkfield, California, by stacking power spectral density (PSD) functions within 12-month windows. We find that PSD levels for both radial and transverse components drop by ∼5 dB following the 2003 San Simeon (M 6.5) earthquake, with a persistent reduction in background levels of ∼2 dB, ...