Accelerograms　of　58　subduction　zone　earthquakes　recorded　by　25　K-NET　coastal　stations　located　in　Sagami　Bay　and　its　adjacent　regions　were　used　to　analyze　the　spectral　properties　of　the　source,　propagation　path,　and　site　effects　by　using　the　generalized　inversion　technique.　The　inverted　Delta　sigma　values　vary　from　1.7　MPa　to　17.4　MPa,　with　an　average　value　of　4.89　MPa　and　a　standard　deviation　of　log(10)　0.23.　Although　the　depths　of　the　selected　earthquakes　are　confined　to　30　km,　which　is　similar　to　those　of　the　crustal　earthquakes,　this　study　obtains　an　average　Delta　sigma　which　coincides　with　the　plate-boundary　earthquakes　rather　than　the　crustal　earthquakes.　It　implies　that　the　stress　condition　of　the　plate-boundary　region　varies　from　the　inland　crust.　The　obtained　Q(f)　=　105.9f(0.)(77)　is　similar　to　the　previous　studies.　The　kappa(0)　of　the　selected　stations　varies　from　0.0479　s　to　0.0904　s,　indicating　high-frequency　attenuation　for　the　coastal　area.　The　inverted　site　response　shows　the　systematic　tendency　for　different　site　classes.　The　amplification　levels　of　class　A　sites　fluctuate　around　one　between　1　Hz　and　10　Hz.　Class　B　sites　indicate　peak　amplification　at　the　resonant　frequency　distributed　between　3　Hz　and　10　Hz.　Most　of　the　Classes　D　and　E　sites　have　peak　amplification　below　about　4　Hz.　Using　the　inversion　results　as　the　input　parameters　of　the　stochastic　finite-fault　method,　an　M(W)5.4　subduction　zone　earthquake　was　simulated.　The　resulting　response　spectra　corresponded　to　the　observations　and　confirmed　that　the　inverted　parameters　are　reasonable.