Grand Geyser Eruptions Time and Date Interval 05/27/99 14:27:23, 0:00:00 05/28/99 05:17:23, 14:50:00 05/28/99 18:19:23, 13:02:00 05/29/99 07:05:23, 12:46:00 05/29/99 19:47:23, 12:42:00 05/30/99 07:47:23, 12:00:00 05/30/99 21:21:23, 13:34:00 05/31/99 08:39:23, 11:18:00 05/31/99 20:13:23, 11:34:00 06/01/99 10:25:23, 14:12:00 06/02/99 01:17:23, 14:52:00 06/02/99 14:57:23, 13:40:00 06/03/99 04:47:23, 13:50:00 06/03/99 16:55:23, 12:08:00 06/04/99 05:07:23, 12:12:00 06/04/99 20:07:23, 15:00:00 06/05/99 08:05:23, 11:58:00 06/06/99 00:39:23, 16:34:00 06/06/99 12:19:23, 11:40:00 06/06/99 22:21:23, 10:02:00 06/07/99 09:29:23, 11:08:00 06/07/99 22:11:23, 12:42:00 06/08/99 11:15:23, 13:04:00 06/08/99 22:11:23, 10:56:00 06/09/99 09:01:23, 10:50:00 06/09/99 21:27:23, 12:26:00 06/10/99 08:33:23, 11:06:00 06/10/99 19:13:23, 10:40:00 06/11/99 08:47:23, 13:34:00 06/11/99 21:57:23, 13:10:00 06/12/99 11:05:23, 13:08:00 06/13/99 01:13:23, 14:08:00 06/13/99 12:21:23, 11:08:00 06/14/99 01:21:23, 13:00:00 06/14/99 09:13:23, 7:52:00 06/14/99 21:07:23, 11:54:00 06/15/99 07:41:23, 10:34:00 06/15/99 19:41:23, 12:00:00 06/16/99 08:27:23, 12:46:00 06/17/99 01:31:23, 17:04:00 06/17/99 16:15:23, 14:44:00 06/18/99 06:01:23, 13:46:00 06/18/99 18:25:23, 12:24:00 06/19/99 08:29:23, 14:04:00 06/19/99 22:23:23, 13:54:00 06/20/99 10:47:23, 12:24:00 06/21/99 00:39:23, 13:52:00 06/21/99 13:59:23, 13:20:00 06/22/99 00:17:23, 10:18:00 06/22/99 14:23:23, 14:06:00 06/23/99 01:05:23, 10:42:00 06/23/99 11:51:23, 10:46:00 06/24/99 00:45:23, 12:54:00 06/24/99 12:47:23, 12:02:00 06/25/99 01:23:23, 12:36:00 06/25/99 13:23:23, 12:00:00 06/26/99 02:33:23, 13:10:00 06/26/99 15:19:23, 12:46:00 06/27/99 02:33:23, 11:14:00 06/27/99 13:41:23, 11:08:00 06/28/99 01:19:23, 11:38:00 06/28/99 14:39:23, 13:20:00 06/29/99 05:21:23, 14:42:00 06/29/99 17:25:23, 12:04:00 06/30/99 02:57:23, 9:32:00 06/30/99 15:01:23, 12:04:00 07/01/99 02:33:23, 11:32:00 07/01/99 14:49:23, 12:16:00 07/02/99 02:17:23, 11:28:00 07/02/99 13:39:23, 11:22:00 07/03/99 02:03:23, 12:24:00 07/03/99 14:11:23, 12:08:00 07/04/99 04:45:23, 14:34:00 07/04/99 16:15:23, 11:30:00 07/05/99 07:15:23, 15:00:00 07/05/99 18:57:23, 11:42:00 07/06/99 05:31:23, 10:34:00 07/06/99 18:05:23, 12:34:00 07/07/99 09:49:23, 15:44:00 07/07/99 20:43:23, 10:54:00 07/08/99 08:31:23, 11:48:00 07/08/99 20:37:23, 12:06:00 07/09/99 10:15:23, 13:38:00 07/09/99 23:05:23, 12:50:00 07/10/99 12:33:23, 13:28:00 07/10/99 21:52:49, 9:19:26 07/11/99 13:00:49, 15:08:00 07/11/99 23:20:49, 10:20:00 07/12/99 12:04:49, 12:44:00 07/13/99 00:38:49, 12:34:00 07/13/99 13:12:49, 12:34:00 07/14/99 02:04:49, 12:52:00 07/14/99 13:28:49, 11:24:00 07/14/99 22:56:49, 9:28:00 07/15/99 11:26:49, 12:30:00 07/15/99 23:42:49, 12:16:00 07/16/99 11:50:49, 12:08:00 07/17/99 01:10:49, 13:20:00 07/17/99 12:44:49, 11:34:00 07/18/99 03:14:49, 14:30:00 07/18/99 16:14:49, 13:00:00 07/19/99 05:30:49, 13:16:00 07/19/99 18:16:49, 12:46:00 07/20/99 05:34:49, 11:18:00 07/20/99 17:14:49, 11:40:00 07/21/99 06:48:49, 13:34:00 07/21/99 20:34:49, 13:46:00 07/22/99 12:02:49, 15:28:00 07/23/99 00:20:49, 12:18:00 07/23/99 12:04:49, 11:44:00 07/23/99 22:28:49, 10:24:00 07/24/99 11:18:49, 12:50:00 07/24/99 23:00:49, 11:42:00 07/25/99 12:30:49, 13:30:00 07/26/99 01:32:49, 13:02:00 07/26/99 14:24:49, 12:52:00 07/27/99 03:12:49, 12:48:00 07/27/99 15:38:49, 12:26:00 07/28/99 03:00:49, 11:22:00 07/28/99 14:04:49, 11:04:00 07/29/99 02:06:49, 12:02:00 07/29/99 14:42:49, 12:36:00 07/30/99 01:52:49, 11:10:00 07/30/99 13:50:49, 11:58:00 07/31/99 02:50:49, 13:00:00 07/31/99 13:58:49, 11:08:00 07/31/99 23:40:49, 9:42:00 08/01/99 09:26:49, 9:46:00 08/01/99 22:52:49, 13:26:00 08/02/99 12:28:49, 13:36:00 08/03/99 01:28:49, 13:00:00 08/03/99 12:34:49, 11:06:00 08/04/99 00:12:49, 11:38:00 08/04/99 10:50:49, 10:38:00 08/04/99 22:18:49, 11:28:00 08/05/99 10:58:49, 12:40:00 08/05/99 23:02:49, 12:04:00 08/06/99 10:36:49, 11:34:00 08/06/99 22:58:49, 12:22:00 08/07/99 11:48:49, 12:50:00 08/08/99 00:28:49, 12:40:00 08/08/99 14:58:49, 14:30:00 08/09/99 02:58:49, 12:00:00 08/09/99 15:06:49, 12:08:00 08/10/99 02:24:49, 11:18:00 08/10/99 13:04:49, 10:40:00 08/11/99 00:26:49, 11:22:00 08/11/99 12:22:49, 11:56:00 08/12/99 02:32:49, 14:10:00 08/12/99 17:04:49, 14:32:00 08/13/99 05:02:49, 11:58:00 08/13/99 19:06:49, 14:04:00 08/14/99 06:24:49, 11:18:00 08/14/99 18:00:49, 11:36:00 08/15/99 07:34:49, 13:34:00 08/15/99 18:56:49, 11:22:00 08/16/99 05:16:49, 10:20:00 08/16/99 18:18:49, 13:02:00 08/17/99 09:26:49, 15:08:00 08/17/99 22:44:49, 13:18:00 08/18/99 12:54:49, 14:10:00 08/18/99 22:38:49, 9:44:00 08/19/99 12:54:49, 14:16:00 08/20/99 02:50:49, 13:56:00 08/20/99 16:40:49, 13:50:00 08/21/99 04:08:49, 11:28:00 09/21/99 13:02:48, 752:53:59 09/21/99 23:49:18, 10:46:30 09/22/99 09:01:18, 9:12:00 09/22/99 17:19:18, 8:18:00 09/23/99 03:36:48, 10:17:30 09/23/99 12:07:48, 8:31:00 09/23/99 22:15:48, 10:08:00 09/24/99 08:50:48, 10:35:00 09/24/99 17:27:48, 8:37:00 09/25/99 01:23:48, 7:56:00 09/25/99 10:58:48, 9:35:00 09/25/99 19:48:07, 8:49:19 09/26/99 03:45:07, 7:57:00 09/26/99 11:55:07, 8:10:00 09/26/99 19:12:07, 7:17:00 09/27/99 02:30:07, 7:18:00 09/27/99 10:00:07, 7:30:00 09/27/99 18:35:07, 8:35:00 09/28/99 03:47:37, 9:12:30 09/28/99 13:52:37, 10:05:00 09/28/99 21:32:37, 7:40:00 09/29/99 05:39:07, 8:06:30 09/29/99 13:14:07, 7:35:00 09/29/99 21:41:48, 8:27:41 09/30/99 05:15:48, 7:34:00 09/30/99 14:24:48, 9:09:00 09/30/99 22:52:18, 8:27:30 10/01/99 08:12:48, 9:20:30 10/01/99 15:18:18, 7:05:30 10/01/99 23:58:48, 8:40:30 10/02/99 08:00:48, 8:02:00 10/02/99 16:55:18, 8:54:30 10/03/99 00:35:48, 7:40:30 10/03/99 09:29:48, 8:54:00 10/03/99 17:32:18, 8:02:30 10/04/99 00:56:48, 7:24:30 10/04/99 09:10:48, 8:14:00 10/04/99 16:26:18, 7:15:30 10/05/99 01:42:18, 9:16:00 10/05/99 09:28:18, 7:46:00 10/05/99 16:01:18, 6:33:00 10/06/99 02:23:48, 10:22:30 10/06/99 10:54:48, 8:31:00 10/06/99 20:19:48, 9:25:00 10/07/99 04:49:18, 8:29:30 10/07/99 15:58:56, 11:09:38 10/08/99 00:44:56, 8:46:00 10/08/99 07:52:26, 7:07:30 10/08/99 16:00:56, 8:08:30 10/08/99 23:13:56, 7:13:00 10/09/99 11:54:56, 12:41:00 10/09/99 23:44:26, 11:49:30 10/10/99 12:39:26, 12:55:00 10/11/99 00:37:56, 11:58:30 10/11/99 11:04:26, 10:26:30 10/14/99 10:47:14, 71:42:48 10/14/99 20:41:14, 9:54:00 10/15/99 07:35:14, 10:54:00 10/15/99 19:32:14, 11:57:00 10/16/99 07:44:14, 12:12:00 10/16/99 19:26:14, 11:42:00 10/17/99 09:59:14, 14:33:00 10/17/99 22:41:14, 12:42:00 10/18/99 11:53:14, 13:12:00 10/18/99 22:53:14, 11:00:00 10/19/99 11:56:14, 13:03:00 10/19/99 23:53:14, 11:57:00 10/20/99 12:23:14, 12:30:00 10/21/99 00:53:14, 12:30:00 10/21/99 13:35:14, 12:42:00 10/22/99 01:20:14, 11:45:00 10/22/99 13:20:14, 12:00:00 10/23/99 01:05:14, 11:45:00 10/23/99 10:26:14, 9:21:00 10/23/99 20:59:14, 10:33:00 10/24/99 09:14:14, 12:15:00 10/24/99 19:29:14, 10:15:00 10/25/99 06:59:14, 11:30:00 10/25/99 18:11:14, 11:12:00 10/26/99 05:20:14, 11:09:00 10/26/99 16:44:14, 11:24:00 10/27/99 07:08:14, 14:24:00 10/27/99 19:53:14, 12:45:00 10/28/99 07:11:14, 11:18:00 10/28/99 17:20:14, 10:09:00 10/29/99 05:14:14, 11:54:00 10/29/99 16:53:14, 11:39:00 10/30/99 05:26:14, 12:33:00 10/30/99 13:32:14, 8:06:00 10/31/99 02:14:14, 12:42:00 10/31/99 11:23:14, 9:09:00 11/01/99 00:14:14, 12:51:00 11/01/99 10:53:14, 10:39:00 11/01/99 20:26:14, 9:33:00 11/02/99 07:59:14, 11:33:00 11/02/99 17:29:14, 9:30:00 11/03/99 06:56:14, 13:27:00 11/03/99 18:20:14, 11:24:00 11/04/99 05:32:14, 11:12:00 11/04/99 16:32:14, 11:00:00 11/04/99 23:59:14, 7:27:00 11/05/99 12:50:14, 12:51:00 11/06/99 01:08:14, 12:18:00 11/06/99 13:47:14, 12:39:00 11/07/99 03:59:14, 14:12:00 11/07/99 14:59:14, 11:00:00 11/08/99 02:02:14, 11:03:00 11/08/99 14:26:14, 12:24:00 11/09/99 00:56:14, 10:30:00 11/09/99 13:50:14, 12:54:00 11/10/99 01:44:14, 11:54:00 11/10/99 14:41:14, 12:57:00 11/11/99 05:20:14, 14:39:00 11/11/99 18:38:14, 13:18:00 11/12/99 07:29:14, 12:51:00 11/12/99 17:29:14, 10:00:00 11/13/99 06:11:14, 12:42:00 11/13/99 16:47:14, 10:36:00 11/14/99 05:29:14, 12:42:00 11/14/99 17:47:14, 12:18:00 11/15/99 04:59:14, 11:12:00 11/15/99 15:35:14, 10:36:00 11/16/99 03:17:14, 11:42:00 11/16/99 14:26:14, 11:09:00 11/17/99 03:32:14, 13:06:00 11/17/99 14:08:14, 10:36:00 11/18/99 03:14:14, 13:06:00 11/18/99 17:17:14, 14:03:00 11/19/99 05:14:14, 11:57:00 11/19/99 16:02:14, 10:48:00 11/20/99 04:29:14, 12:27:00 11/20/99 15:35:14, 11:06:00 11/21/99 01:17:14, 9:42:00 11/21/99 11:14:14, 9:57:00 11/21/99 23:02:14, 11:48:00 11/22/99 11:32:14, 12:30:00 11/22/99 21:23:14, 9:51:00 11/23/99 09:41:14, 12:18:00 11/23/99 19:26:14, 9:45:00 11/24/99 07:14:14, 11:48:00 11/24/99 21:02:14, 13:48:00 11/25/99 08:08:14, 11:06:00 11/25/99 17:23:14, 9:15:00 11/26/99 02:53:14, 9:30:00 11/26/99 12:53:14, 10:00:00 11/26/99 22:11:14, 9:18:00 11/27/99 08:44:14, 10:33:00 11/27/99 18:59:14, 10:15:00 11/28/99 07:29:14, 12:30:00 11/28/99 20:17:14, 12:48:00 11/29/99 07:44:14, 11:27:00 11/29/99 18:14:14, 10:30:00 11/30/99 04:23:14, 10:09:00 11/30/99 16:20:14, 11:57:00 12/01/99 04:47:14, 12:27:00 12/01/99 15:29:14, 10:42:00 12/02/99 03:17:14, 11:48:00 12/02/99 14:23:14, 11:06:00 12/03/99 02:56:14, 12:33:00 12/03/99 14:32:14, 11:36:00 12/03/99 23:32:14, 9:00:00 12/04/99 11:41:14, 12:09:00 12/04/99 22:05:14, 10:24:00 12/05/99 10:02:14, 11:57:00 12/05/99 20:53:14, 10:51:00 12/06/99 08:02:14, 11:09:00 12/06/99 19:41:14, 11:39:00 12/07/99 03:56:14, 8:15:00 12/07/99 12:53:14, 8:57:00 12/07/99 23:35:14, 10:42:00 12/08/99 13:17:14, 13:42:00 12/08/99 23:47:14, 10:30:00 12/09/99 11:59:14, 12:12:00 12/10/99 02:41:14, 14:42:00 12/10/99 15:20:14, 12:39:00 12/11/99 03:08:14, 11:48:00 12/11/99 14:44:14, 11:36:00 12/12/99 00:11:14, 9:27:00 12/12/99 11:14:14, 11:03:00 12/12/99 21:53:14, 10:39:00 12/13/99 09:11:14, 11:18:00 12/13/99 20:08:14, 10:57:00 12/14/99 06:26:14, 10:18:00 12/14/99 18:56:14, 12:30:00 12/15/99 05:59:14, 11:03:00 12/15/99 17:05:14, 11:06:00 12/16/99 04:11:14, 11:06:00 12/16/99 16:08:14, 11:57:00 12/17/99 04:41:14, 12:33:00 12/17/99 16:38:14, 11:57:00 12/18/99 03:35:14, 10:57:00 12/18/99 12:47:14, 9:12:00 12/18/99 22:53:14, 10:06:00 12/19/99 09:14:14, 10:21:00 12/19/99 19:17:14, 10:03:00 12/20/99 04:41:14, 9:24:00 12/20/99 15:02:14, 10:21:00 12/21/99 00:38:14, 9:36:00 12/21/99 11:29:14, 10:51:00 12/21/99 22:14:14, 10:45:00 12/22/99 10:02:14, 11:48:00 12/22/99 22:20:14, 12:18:00 12/23/99 09:44:14, 11:24:00 12/23/99 20:50:14, 11:06:00 12/24/99 09:44:14, 12:54:00 12/24/99 20:56:14, 11:12:00 12/25/99 05:56:14, 9:00:00 12/25/99 18:08:14, 12:12:00 12/26/99 06:53:14, 12:45:00 12/26/99 17:56:14, 11:03:00 12/27/99 06:41:14, 12:45:00 12/27/99 16:53:14, 10:12:00 12/28/99 04:35:14, 11:42:00 12/28/99 14:47:14, 10:12:00 12/29/99 02:11:14, 11:24:00 12/29/99 10:14:14, 8:03:00 12/29/99 18:29:14, 8:15:00 12/30/99 08:32:14, 14:03:00 12/30/99 19:23:14, 10:51:00 12/31/99 08:20:14, 12:57:00 12/31/99 20:08:14, 11:48:00 Total of 387 eruptions