In the early 1990s, a band emerged from Olympia, Washington that combined tense, dissonant jabs of noise rock with the churning energy of post-hardcore. By 2000, Unwound had sharpened its sound into a brooding, melancholic opus, the two-disc Leaves Turn Inside You. In the era of nü-metal, the trio’s angular, focused sound was a revelation, and it influenced many punk-leaning bands. The band broke up two years later, however, and while its members have played in various other projects over the years, singer/guitarist Justin Trosper put down his instrument and microphone to focus on recording other bands. Then, in 2011, Trosper and original Unwound drummer Brandt Sandeno — as well as drummer Kris Cunningham and bassist Meg Cunningham — formed Survival Knife, which just released its debut album, Loose Power. While much of the dissonance of Unwound (as well as Trosper’s unmistakable voice) remains, Survival Knife is also proggier, mathier, and more rocking. In some ways, it’s a drastic counterpoint to Leaves Turn Inside You. The band plays the Hemlock Tavern (1131 Polk St., San Francisco) on Thursday with Hungry Ghost (featuring former Unwound drummer Sara Lund) and California (featuring Adam Pfahler of Jawbreaker and Jason White of Green Day).