Mix olive oil, soy sauce, sriracha sauce, sesame oil, garlic, and ginger together in a bowl. Place salmon in a shallow baking dish or resealable plastic bag; cover with marinade. Refrigerate for 2 hours.
Mix mayonnaise, sriracha sauce, soy sauce, rice vinegar, lime juice, sesame oil, and onion powder together to make the sauce.
Heat a large skillet over medium heat. Add salmon skin-side down. Season top with salt and pepper. Cook for 4 minutes. Flip and continue cooking until flesh flakes easily with a fork, about 4 minutes. Drizzle sauce on top.