The field trip on Saturday, May 4, visits the windward side of Koʻolau volcano, with stops in the vicinity of Kaneohe. We'll examine outstanding dike outcrops, contemplate the rift zone from a short hike toward Oneawa Hills, and put our hands on boulders interpreted as Koʻolau caldera breccia. No trip would be complete without a head-scratching discussion of rejuvenation volcanism, so we will have at least one stop so-dedicated. A highlight of the trip will be a tour into the Waiheʻe dike tunnel, where we travel inside the mountain 1500' to the dike that impounds the aquifer serving the freshwater needs of 40% of windward Oahu residents.
We will meet at 8 am at Makiki District Park, where you can park your cars and load into vans. Vans will return to Makiki District Park by 4 pm. Lunch will be provided. Attendance on the Waiheʻe tour is limited (by the Board of Water Supply) to 20, so participation on that leg of the trip is offered on a first-come first-serve basis. If interest exceeds the number we can take, we will create a waiting list to offer spots in the corresponding RSVP sequence. Those who cannot join us in the tunnel, or are tunnel-averse, are welcome to meet us at other stops. (A timetable and list of stops will be distributed in advance.) However, note that we cannot guarantee lunch for the self-transported participants, especially those who donʻt RSVP.
How many in your party will participate in the field trip?
