that together with a second large volcano called Waianae forms most of Oahu’s land mass. The Koolau and Waianae volcanoes are about 2 to 3 million years old. No Oahu volcano is active.

Honolulu police say two men in their 40s were arrested last week after state conservation officers heard gunshots at the Waianae Kai Forest Reserve. The Honolulu Police Department and state ...