Patent ID: 7800981

Claim:
A portable seismograph comprising: a support and containment structure comprising at least a bottom portion made of a material having a seismic impedance value ranging between 2×10 5 and 4×10 6 kg/(m 2 s), said containment structure defining an opened side configured to receive said bottom portion; at least three sensors placed orthogonally to one another, each comprising at least one electrodynamic or capacitive transducer, said sensors being attachable to said bottom portion; a level to position the containment structure horizontally, said level being exposed through a side of said containment structure opposite said opened side; a control unit connected to said sensors and designed to record, to manage acquisition mode and to process data, said control unit further comprising a signal amplification digitization and filtering system, a mass memory, external controls to adjust acquisition, a display, and a microprocessor; a GPS receiver adjacent to said side of said containment structure opposite said opened side; an external surface comprising a mirror, or metalized finish; an independent internal power source; and means for coupling to the ground designed not to perturb the seismic noise detectable by the sensors; wherein said means for coupling to the ground further comprising nail or screw elements protruding from said bottom portion of said support and containment structure, and a pad made of granular material or with rheological behavior and having a seismic impedance ranging between 2×10 5 and 4×10 6 kg/(m 2 s), said nail or screw elements provide a rigid coupling of said support and containment structure and the ground, and to raise the resonance frequency of said portable seismograph, said pad dampens vibrations of said portable seismograph that interfere with seismic tremors and perturb the measurement thereof from said portable seismograph; wherein a portion of said control unit being exposed through said side of said containment structure opposite said opened side.