The effect of the vertical component earthquakes on structural behaviour unreinforced masonry (URM) walls is usually not considered by technical codes for ordinary buildings. Recent scientific literature, however, indicates that earthquake may play a significant role in crack pattern URM and their collapse. This paper investigates seismic capacity damage scenario two-story regular wall, describ...

We present the results of ground-based Ultra Low Frequency (ULF) magnetic field measurements observed from June to August 2004 during the Bovec earthquake on 12 July 2004. Further we give information about the seismic activity in the local observatory region for an extended time span 2004 and 2005. ULF magnetic field data are provided by the South European Geomagnetic Array (SEGMA) where the ex...

We report the detection of an earthquake by a space-based measurement. The Gravity Recovery and Climate Experiment (GRACE) satellites observed a +/-15-microgalileo gravity change induced by the great December 2004 Sumatra-Andaman earthquake. Coseismic deformation produces sudden changes in the gravity field by vertical displacement of Earth's layered density structure and by changing the densit...

The paper studied the vibrations of buildings on sliding foundation with dry friction under action real earthquakes at intensity 8 and 9 MSK-64 scale. It was developed a unique algorithm for calculating displacements, velocities, accelerations, shear forces resulting from simultaneous horizontal vertical components seismogram record. four-story nine-story set three earthquake records. shown tha...

S U M M A R Y W phase is a long period phase arriving before S wave. It can be interpreted as superposition of the fundamental, first, second and third overtones of spheroidal modes or Rayleigh waves and has a group velocity from 4.5 to 9 km s−1 over a period range of 100–1000 s. The amplitude of long period waves better represents the tsunami potential of an earthquake. Because of the fast gro...