Chunky Charred Fresh Tuna and Avocado Salsa with Corn Chips

Name: Chunky Charred Fresh Tuna and Avocado Salsa with Corn Chips
Ingredients: 1 1/2 to 2/3-pound tuna steak; 1/2 teaspoon chili powder; 1/4 teaspoon ground cumin; 1/4 teaspoon ground coriander; 1 teaspoon olive oil, plus 1 tablespoon; Kosher salt; 1 1/2 hass avocadoes, diced; 6 small or 4 large vine-ripe tomatoes, seeded and diced; 2 scallions, thinly sliced on an angle; 1/2 to 1 jalapeno, seeded and finely diced; 3 tablespoons roughly chopped cilantro; The juice of 1 lime; The juice of 1/2 lemon; Tortilla chips, for serving