Event #22 - Summary, and parameter estimates with source IDs                                                  Full references for Event #  22
Account originates in Holden (1887); and is repeated in other catalogs: "1846-52; exact date not given. In Oregon City, on Rock Creek, near Portland, Oregon, explosions like those of a cannon were heard for nearly the whole of a day. At first these were about half an hour apart; then they came nearer together, until at last they were no further apart than one minute or so; finally they died away. The water in Rock Creek did not run for three days.-Verbal account of Geo. J. Ainsworth, Esq."
TIME							LOCATION			MAGNITUDE		INTENSITY
YR	MO	DAY	HR	MIN	AM/PM	Time Type	LAT(N)	LON(W)	DEP (km)	MAG	Mag Type	Inten- sity	Int. Type	Felt Area	Felt Area Int.	Felt Area Units
1846							45.35	122.59