Preheat the oven to 375 degrees. In a large saucepan, heat 1/4 cup of the olive oil until shimmering. Add the onion and garlic and cook over moderately high heat, stirring occasionally, until softened, about 5 minutes. Add the tomatoes, oregano, and bay leaves and cook, stirring occasionally, until the tomatoes are just beginning to break down, about 5 minutes. Stir in the olives, capers, and jalapenos and simmer for 2 minutes longer. Discard the bay leaves.

In a large ovenproof skillet, heat the remaining 1 tablespoon of oil until shimmering. Season the salmon with salt and pepper and add to the skillet, skin side down. Cook over high heat until the skin begins to brown, about 4 minutes. Transfer the skillet to the oven and roast the fish for about 10 minutes, until slightly rare on the inside. Transfer the fish to plates, spoon the sauce all around and serve.