Date and time | Mag Depth | Nearest volcano (distance) | Location | Details | Map |
| Monday, October 25, 2021 07:44 GMT (2 earthquakes) | |||||
| Oct 25, 2021 12:44 am (GMT -7) (Oct 25, 2021 07:44 GMT) | 1.5 0.6 km | 63 km (39 mi) | 13km SE of Big Bear City, CA | More | Map |
| Oct 25, 2021 12:03 am (GMT -7) (Oct 25, 2021 07:03 GMT) | ? n/a | 129 km (80 mi) | 3.6 mi south of Menifee, Riverside County, California, USA (unconfirmed) I FELT IT - 2 reports | More | Map |
| Sunday, October 24, 2021 23:44 GMT (10 earthquakes) | |||||
| Oct 24, 2021 4:44 pm (GMT -7) (Oct 24, 2021 23:44 GMT) | 1.5 16 km | 99 km (62 mi) | 7km WSW of Calimesa, CA | More | Map |
| Oct 24, 2021 3:59 pm (GMT -7) (Oct 24, 2021 22:59 GMT) | 1.7 7.9 km | 104 km (65 mi) | 1km ESE of Anza, CA | More | Map |
| Oct 24, 2021 2:27 pm (GMT -7) (Oct 24, 2021 21:27 GMT) | 1.6 7.5 km | 101 km (63 mi) | 5km NNE of Fontana, CA | More | Map |
| Oct 24, 2021 2:04 pm (GMT -7) (Oct 24, 2021 21:04 GMT) | 1.2 17 km | 120 km (75 mi) | 9km SW of Idyllwild, CA | More | Map |
| Oct 24, 2021 8:42 am (GMT -7) (Oct 24, 2021 15:42 GMT) | 1.0 13 km | 98 km (61 mi) | 7km S of Redlands, CA | More | Map |
| Oct 24, 2021 7:08 am (GMT -7) (Oct 24, 2021 14:08 GMT) | 1.5 14 km | 98 km (61 mi) | 7km S of Redlands, CA 1 report | More | Map |
| Oct 24, 2021 6:41 am (GMT -7) (Oct 24, 2021 13:41 GMT) | 1.7 10.2 km | 59 km (37 mi) | 12km ENE of Borrego Springs, CA | More | Map |
| Oct 24, 2021 5:48 am (GMT -7) (Oct 24, 2021 12:48 GMT) | 1.2 18 km | 97 km (60 mi) | 2km ESE of Loma Linda, CA | More | Map |
| Oct 24, 2021 4:19 am (GMT -7) (Oct 24, 2021 11:19 GMT) | 1.5 3.1 km | 113 km (70 mi) | 9km NE of Aguanga, CA | More | Map |
| Oct 23, 2021 6:28 pm (GMT -7) (Oct 24, 2021 01:28 GMT) | 1.3 15 km | 96 km (60 mi) | 2km N of Loma Linda, CA | More | Map |
| Saturday, October 23, 2021 21:49 GMT (6 earthquakes) | |||||
| Oct 23, 2021 2:49 pm (GMT -7) (Oct 23, 2021 21:49 GMT) | 1.6 11 km | 66 km (41 mi) | 16km NNE of Borrego Springs, CA | More | Map |
| Oct 23, 2021 2:24 pm (GMT -7) (Oct 23, 2021 21:24 GMT) | 2.0 16 km | 95 km (59 mi) | 3km SW of San Bernardino, CA | More | Map |
| Oct 23, 2021 11:39 am (GMT -7) (Oct 23, 2021 18:39 GMT) | 1.3 11 km | 97 km (60 mi) | 5km WSW of Devore, CA | More | Map |
| Oct 23, 2021 11:37 am (GMT -7) (Oct 23, 2021 18:37 GMT) | 1.8 10.5 km | 97 km (60 mi) | 5km W of Devore, CA | More | Map |
| Oct 23, 2021 7:31 am (GMT -7) (Oct 23, 2021 14:31 GMT) | 1.1 16 km | 118 km (73 mi) | 9km SE of Valle Vista, CA | More | Map |
| Oct 22, 2021 10:56 pm (GMT -7) (Oct 23, 2021 05:56 GMT) | 1.1 4 km | 106 km (66 mi) | 4km NW of Fontana, CA | More | Map |
| Friday, October 22, 2021 23:35 GMT (8 earthquakes) | |||||
| Oct 22, 2021 4:35 pm (GMT -7) (Oct 22, 2021 23:35 GMT) | 1.6 0.5 km | 78 km (48 mi) | 16km N of Cabazon, CA | More | Map |
| Oct 22, 2021 2:34 pm (GMT -7) (Oct 22, 2021 21:34 GMT) | 1.6 14 km | 96 km (60 mi) | 3km E of Loma Linda, CA | More | Map |
| Oct 22, 2021 1:55 pm (GMT -7) (Oct 22, 2021 20:55 GMT) | 1.2 10 km | 116 km (72 mi) | 5km NW of Mira Loma, CA | More | Map |
| Oct 22, 2021 12:11 pm (GMT -7) (Oct 22, 2021 19:11 GMT) | 2.0 0.5 km | 128 km (80 mi) | 5km SSE of Home Gardens, CA | More | Map |
| Oct 22, 2021 5:57 am (GMT -7) (Oct 22, 2021 12:57 GMT) | 1.7 10.6 km | 90 km (56 mi) | 3km WSW of Yucaipa, CA | More | Map |
| Oct 22, 2021 1:31 am (GMT -7) (Oct 22, 2021 08:31 GMT) | ? n/a | 142 km (88 mi) | 3.6 mi northeast of Temecula, Riverside County, California, USA (unconfirmed) I FELT IT - 4 reports | More | Map |
| Oct 22, 2021 12:41 am (GMT -7) (Oct 22, 2021 07:41 GMT) | ? n/a | 138 km (86 mi) | 3 mi west of Laguna, Riverside County, California, USA (unconfirmed) I FELT IT - 2 reports | More | Map |
| Oct 21, 2021 9:13 pm (GMT -7) (Oct 22, 2021 04:13 GMT) | 1.2 12 km | 67 km (42 mi) | 11km NNE of Borrego Springs, CA | More | Map |
| Thursday, October 21, 2021 23:14 GMT (8 earthquakes) | |||||
| Oct 21, 2021 4:14 pm (GMT -7) (Oct 21, 2021 23:14 GMT) | ? n/a | 173 km (107 mi) | 2.5 mi southwest of Laguna Niguel, Orange County, California, USA (unconfirmed) I FELT IT - 2 reports | More | Map |
| Oct 21, 2021 12:31 pm (GMT -7) (Oct 21, 2021 19:31 GMT) | 1.1 14 km | 77 km (48 mi) | 15km NNW of Borrego Springs, CA | More | Map |
| Oct 21, 2021 12:31 pm (GMT -7) (Oct 21, 2021 19:31 GMT) | 1.3 29 km | 108 km (67 mi) | 6km NW of Idyllwild, CA | More | Map |
| Oct 21, 2021 10:22 am (GMT -7) (Oct 21, 2021 17:22 GMT) | 2.4 15 km | 112 km (70 mi) | 10km NNW of Anza, CA | More | Map |
| Oct 21, 2021 10:19 am (GMT -7) (Oct 21, 2021 17:19 GMT) | 1.0 15 km | 112 km (70 mi) | 10km NNW of Anza, CA | More | Map |
| Oct 21, 2021 8:40 am (GMT -7) (Oct 21, 2021 15:40 GMT) | 1.1 9.2 km | 110 km (68 mi) | 8km NNW of Rancho Cucamonga, CA | More | Map |
| Oct 21, 2021 5:22 am (GMT -7) (Oct 21, 2021 12:22 GMT) | 1.6 12 km | 67 km (42 mi) | 8km NNE of Borrego Springs, CA | More | Map |
| Oct 21, 2021 4:23 am (GMT -7) (Oct 21, 2021 11:23 GMT) | ? n/a | 125 km (78 mi) | 2.6 mi south of Perris, Riverside County, California, USA (unconfirmed) I FELT IT - 3 reports | More | Map |
| Wednesday, October 20, 2021 20:33 GMT (6 earthquakes) | |||||
| Oct 20, 2021 1:33 pm (GMT -7) (Oct 20, 2021 20:33 GMT) | 1.2 0.5 km | 125 km (78 mi) | Quarry Blast - 2km NE of Home Gardens, CA | More | Map |
| Oct 20, 2021 12:37 pm (GMT -7) (Oct 20, 2021 19:37 GMT) | 1.4 3 km | 128 km (80 mi) | 5km SSE of Home Gardens, CA | More | Map |
| Oct 20, 2021 6:34 am (GMT -7) (Oct 20, 2021 13:34 GMT) | 1.9 6.8 km | 106 km (66 mi) | 3km WNW of Fontana, CA | More | Map |
| Oct 19, 2021 11:34 pm (GMT -7) (Oct 20, 2021 06:34 GMT) | 1.1 9.3 km | 108 km (67 mi) | 9km N of Rancho Cucamonga, CA | More | Map |
| Oct 19, 2021 11:25 pm (GMT -7) (Oct 20, 2021 06:25 GMT) | 1.6 9.7 km | 54 km (34 mi) | 7km NW of Big Bear City, CA | More | Map |
| Oct 19, 2021 7:49 pm (GMT -7) (Oct 20, 2021 02:49 GMT) | 1.2 4.5 km | 104 km (65 mi) | 4km NW of Fontana, CA | More | Map |
| Tuesday, October 19, 2021 22:38 GMT (10 earthquakes) | |||||
| Oct 19, 2021 3:38 pm (GMT -7) (Oct 19, 2021 22:38 GMT) | 1.4 3 km | 113 km (70 mi) | 9km ENE of Aguanga, CA | More | Map |
| Oct 19, 2021 12:59 pm (GMT -7) (Oct 19, 2021 19:59 GMT) | 1.0 2.7 km | 127 km (79 mi) | 2km ESE of Home Gardens, CA | More | Map |
| Oct 19, 2021 12:11 pm (GMT -7) (Oct 19, 2021 19:11 GMT) | 2.8 14 km | 118 km (73 mi) | 13 mi southeast of Hemet, Riverside County, California, USA | More | Map |
| Oct 19, 2021 11:11 am (GMT -7) (Oct 19, 2021 18:11 GMT) | 2.0 14 km | 118 km (73 mi) | 10km SSW of Idyllwild, CA | More | Map |
| Oct 19, 2021 10:58 am (GMT -7) (Oct 19, 2021 17:58 GMT) | 1.8 14 km | 118 km (73 mi) | 10km SSW of Idyllwild, CA | More | Map |
| Oct 19, 2021 10:58 am (GMT -7) (Oct 19, 2021 17:58 GMT) | 1.2 0.3 km | 105 km (65 mi) | 3km ENE of Moreno Valley, CA | More | Map |
| Oct 19, 2021 7:02 am (GMT -7) (Oct 19, 2021 14:02 GMT) | 1.3 6.2 km | 128 km (80 mi) | 2km W of Brea, CA | More | Map |
| Oct 19, 2021 6:53 am (GMT -7) (Oct 19, 2021 13:53 GMT) | 1.2 3.4 km | 128 km (80 mi) | 3km SW of Norco, CA | More | Map |
| Oct 18, 2021 5:43 pm (GMT -7) (Oct 19, 2021 00:43 GMT) | 1.0 4.8 km | 104 km (65 mi) | 4km NNW of Fontana, CA | More | Map |
| Oct 18, 2021 5:27 pm (GMT -7) (Oct 19, 2021 00:27 GMT) | 1.3 15 km | 93 km (58 mi) | 12km ESE of Anza, CA | More | Map |
| Monday, October 18, 2021 19:34 GMT (2 earthquakes) | |||||
| Oct 18, 2021 12:34 pm (GMT -7) (Oct 18, 2021 19:34 GMT) | 1.1 4.9 km | 106 km (66 mi) | 4km NW of Fontana, CA | More | Map |
| Oct 18, 2021 10:45 am (GMT -7) (Oct 18, 2021 17:45 GMT) | 2.2 13 km | 103 km (64 mi) | 5km N of Moreno Valley, CA | More | Map |
Estimated combined seismic energy released: 2 x 109 joules (551 kilowatt hours, equivalent to 0.474 tons of TNT) More info
