front panel 101 and the metal case 102 have mounting holes proximate their corners to permit mounting bolts to pass through for securing the seismic control switch in place a red led 104 is labeled u201c alarm u201d this light 39 s turning on means that the microcontroller analyzed the detected vibrations and concluded that the vibrations were due to either an earthquake or an explosion and that an alarm condition exists a green led 105 is labeled u201c ready u201d this led indicates that the system has performed a self test and that all tested parts are working correctly the switch labeled u201c test u201d 106 is used to instruct the microcontroller to test the alarm condition the relays 212 and 213 which are shown in fig2 the audible alarm or buzzer 109 and the external circuit to which the seismic switch is connected 601 602 603 and 604 which are shown in fig6 the audible alarm 109 is mounted on a side wall of the metal case 102 and is held in place by an external nut 110 the u201c reset u201d switch 107 forces the microcontroller to clear the alarm condition and to return to the initial state including performing the u201c test u201d function described above wires 111 for power and other connections to the external security system pass through a hole in the top face of the metal case 102 turning to fig2 one preferred embodiment of the detection and control circuit is further described during normal operation the ready led 105 remains on if a seismic signal 201 is detected by the accelerometers.