Seeking Norwegian OLSENs

I would like to find collateral branches of my OLSEN family still in Norway. Here are my great-grandparents: Johan OLSEN Gjerde, born 6-Oct-1848 in Nordalen (Møre og Romsdal), emigrated via Halifax to the Portland Oregon area from Bergen 18-Mar-1874 (probably on the S/S Hibernian of the Allen Line), died 13-Nov-1920 in Portland Oregon. Oline CHRISTIANSDTR. Engeseth, born about 1849 in Nordalen, emigrated via New York from Bergen 10-May-1879 (probably on the S/S Germanic of the White Star (Stjerne) Line), died 16-Mar-1942 in Clackamas County Oregon. I believe Johan to have been the son of Ole JOHNSON (b. about 1809) and Gurine RASMUSDTR. (b. about 1822). I also think Johan had these siblings, all born in Nordalen: Inger OLSDTR. (b. about 1846) Else OLSDTR. (b. about 1849) Thomas OLSEN (b. about 1852) Nicoline OLSDTR. (b. about 1858) Elen Malene OLSDTR. (b. about 1863) Jens OLSEN (b. about 1863) (a twin?) I can provide quite a bit of detail about the extended OLSEN family in America, which might be of interest to a Norwegian OLSEN genealogist.