THE SOUTH CASPIAN BASIN IS SURROUNDED BY THE CENTRAL ALBORZ MOUNTAIN RANGE IN SOUTH AND TALESH MOUNTAIN IN ITS SOUTH WESTERN SIDE. THE CENTRAL ALBORZ CORRESPONDS TO THE E-W TRENDING AND TALESH IS CORRESPONDING TO THE NS TRENDING THAT BOTH OF THEM BOUNDING THE CASPIAN SEA TO THE SOUTH AND SOUTH WEST, AS AN ACTIVE TERRAIN BELONGING TO THE ALPINE-HIMALAYAN SEISMIC BELT. THE KHAZAR (CASPIAN) FAULT, NEARLY 450 KILOMETRES LONG, AND ASTARA FAULT, 110KM LONG APPEAR AS THE NORTHERN BORDER OF THE CENTRAL ALBORZ AND EASTERN BORDER OF THE TALESH CHAIN WHERE MESOZOIC AND PALEOGENE ROCK UNITS OVERRIDDEN ON THE YOUNG DEPOSITS OF THE SOUTH CASPIAN PLAIN. BASE ON MORPHOTECTONICS AND PALEOSEISMOLOGY STUDIES, WE SUGGEST THAT A MAJOR PART OF THE PRESENT SHORTENING IN ALBORZ IS LOCALIZED ON THE NORTHERN FACE OF THE CHAIN ALONG THE KHAZAR FAULT ZONE; IT IS HOWEVER WORTH NOTING THAT THIS CONTACT MIGHT BE LOCATED FURTHER TO THE NORTH UNDER THE SEA. THIS BORDER CAN BE INTERPRETED AS FRONTAL CONTACT BETWEEN ALBORZ AND THE SOUTH-CASPIAN BASIN. A RECENT STRATIGRAPHIC STUDY ON THE HOLOCENE -PLEISTOCENE IN EAST OF THE HARAZ VALLEY, SUGGESTS AN INCISION RATE OF 1.25 MM/YR AS CALCULATED FOR THE LAST 12 KYR. IF IT IS ASSUMED THAT THE INCISION IS RELATED TO THE VERTICAL COMPONENT ALONG THE KHAZAR FAULT, THE HORIZONTAL N-S SHORTENING ALONG THIS FAULT WOULD BE 2.5 MM/YR (FOR A 35OS-DIPPING FAULT). THIS IS ONLY 1.10TH OF THE TOTAL SHORTENING OF ALBORZ, ESTIMATED 5±2 MM/YR.THE ASTARA FAULT AS MAJOR ACTIVE FAULT SYSTEM IN SOUTH WEST OF THE SCB THAT REGARDS TO THE SEISMIC AND GEOPHYSICAL OBSERVATION PROPAGATED UNDER THE SEA AS WELL AS THE KHAZAR FAULT. MANY EARTHQUAKES MAY HAVE BEEN CAUSED BY THE ACTIVITY OF VARIOUS BRANCHES OF THESE FAULT SYSTEMS IN LAND OR MARINE PARTS OF THE SCB.REGARDS TO THE BASIN GEOMETRY, PROPAGATED FAULTS TO NORTH OR EAST AND ITS LAND SLOPE, BESIDES MORE THAN 20 KM THICKNESS OF NEOGENE AND QUATERNARY DEPOSITS IN THE SOUTH CASPIAN BASIN IN THE SCENARIO WITH THE POSSIBILITY OF A SEISMIC ACTIVITY ON THE KHAZAR OR THE ASTARA FAULTS OR ONE OF THE THEM PROPAGATED BRANCHES TO THE NORTH AND EAST WITH MAGNITUDE M³7, AS THE CLOSEST ACTIVE FAULTS TO THE GREAT LAKE CAN TRIGGER MANY LARGE SUBMARINE EARTHQUAKE RUPTURES OR SUBMARINE LANDSLIDES WHICH IS ITS POTENTIAL FOR GENERATING TSUNAMIS IN THE STEEP SOUTHERN COAST. AND IF THE TSUNAMI WAVE HEIGHT REACHES TO MORE THAN 5 METERS, IMPACT AREA COULD BE ESTIMATED ~ 20 KM ESPECIALLY IN SOUTH EAST OF THE CASPIAN BEACH.