| Comments: | Observed Little Brother Geyser from 1547 to 1721; 107 eruptions seen in 94 minutes (average ~1.14 eruptions per minute); durations ranged from ~2s to ~9s; low blipping & roiling preplay of slightly variable energy and variable duration; pool level usually fluctuated before eruptions - sometimes with overflow; intervals usually about 0.5 minute to 1 minute; some "pauses" with longer intervals of 2 to 4 minutes - pauses tended to cluster in groups of 3 to 4; a few inferred "two burst" eruptions - otherwise, they were fairly short intervals - 10s to 16s. Eruptions at 1547, 1548, 1549, late 1549, 1550, 1551:54, 1552, 1553 (not tall), later 1553 (bigger), 1554, 1555:15, 1555:45, 1556:16, 1556:54, 1557:47, 1558, 1559, 1559:59, 1601, 1604:35, 1607, 1609:24, 1610, 1611, 1611:34, 1612:29, 1613, 1614:06, 1615:02 (d=~7s), 1616:00, 1617 (d=~8s), late 1617, 1618:46, 1619:30 (very low), 1619:56, 1620:41, 1620:51 (single burst), 1621:33 (d=~5s), 1622:07 (single burst), 1622:31, 1623:13, 1623:23, 1624:00, 1624:48, 1625:25, 1626:33, 1627, 1627:48, 1628, 1629:20, 1629:50, 1630:30, 1631:52, 1632:33, 1633, late 1633, 1634, late 1634, ~mid-1635, early 1636, 1636:48, 1637:33, early 1638, 1638:56, 1641:01, 1642:58, 1644:59, 1646:05, 1647:04, 1647:16, 1647:59, 1648:58, 1649:51, 1651:00, 1652:01 (d=~7s), 1652:55 (d=~5s), 1654:00, 1654:54, 1655:47, 1656:42, 1657:46 (d=~6s), 1658:31 (d=~7s), 1659:23 (d=~4s), 1700:21 (d=~5s), 1701:26 (d=~6s), 1702:13 (d=~5s), 1703:38 (d=~8s), 1704:40, 1705:32 (d=~8s), 1706:29 (d=~2s or less), 1707:05, 1707:43 (high & short duration), early 1708, 1708:47, 1709:31, 1710:09, 1710:42, 1711:19, 1712:01 (d=~7s), 1712:48, 1715:18, 1717:11 (d=~8s), 1718:53 (d=~5s), 1719:44 (d=~9s), 1720:21 (d=~5s), 1721:26 (d=~6s) - all closed intervals. |