Date and time | Mag Depth | Nearest volcano (distance) | Location | Details | Map |
| Fri, Sep 17, 2021 (GMT) (5 earthquakes) | |||||
| Sep 16, 2021 11:48 pm (GMT -7) (Sep 17, 2021 06:48:06 GMT) | 1.3 15 km | 99 km (62 mi) | 1km SW of Loma Linda, CA | More | Map |
| Sep 16, 2021 9:26 pm (GMT -7) (Sep 17, 2021 04:26:33 GMT) | 1.1 9.3 km | 100 km (62 mi) | 4km S of Loma Linda, CA | More | Map |
| Sep 16, 2021 7:57 pm (GMT -7) (Sep 17, 2021 02:57:00 GMT) | 1.3 1.3 km | 131 km (81 mi) | 2km WNW of Corona, CA | More | Map |
| Sep 16, 2021 6:52 pm (GMT -7) (Sep 17, 2021 01:52:36 GMT) | 2.2 10.1 km | 64 km (40 mi) | 8km SSE of Big Bear City, CA | More | Map |
| Sep 16, 2021 6:52 pm (GMT -7) (Sep 17, 2021 01:52:30 GMT) | 1.6 7.2 km | 96 km (60 mi) | 3km SE of Lytle Creek, CA | More | Map |
| Thu, Sep 16, 2021 (GMT) (9 earthquakes) | |||||
| Sep 16, 2021 4:14 pm (GMT -7) (Sep 16, 2021 23:14:45 GMT) | 1.0 18 km | 97 km (60 mi) | 3km SE of Loma Linda, CA | More | Map |
| Sep 16, 2021 2:11 pm (GMT -7) (Sep 16, 2021 21:11:51 GMT) | 1.3 8.5 km | 55 km (34 mi) | 4km ENE of Big Bear City, CA | More | Map |
| Sep 16, 2021 1:54 pm (GMT -7) (Sep 16, 2021 20:54:24 GMT) | 1.1 17 km | 96 km (60 mi) | 1km NNE of Loma Linda, CA | More | Map |
| Sep 16, 2021 10:10 am (GMT -7) (Sep 16, 2021 17:10:26 GMT) | 1.3 1.5 km | 127 km (79 mi) | 8km SW of Mead Valley, CA | More | Map |
| Sep 16, 2021 9:14 am (GMT -7) (Sep 16, 2021 16:14:58 GMT) | 1.5 1 km | 129 km (80 mi) | 1km NE of San Dimas, CA | More | Map |
| Sep 16, 2021 8:15 am (GMT -7) (Sep 16, 2021 15:15:51 GMT) | 1.0 17 km | 83 km (52 mi) | 8km SW of Morongo Valley, CA | More | Map |
| Sep 16, 2021 4:27 am (GMT -7) (Sep 16, 2021 11:27:14 GMT) | 1.1 2.8 km | 94 km (58 mi) | 1km SW of Devore, CA | More | Map |
| Sep 15, 2021 9:50 pm (GMT -7) (Sep 16, 2021 04:50:39 GMT) | 1.4 0.7 km | 127 km (79 mi) | 5km W of Good Hope, CA | More | Map |
| Sep 15, 2021 9:49 pm (GMT -7) (Sep 16, 2021 04:49:56 GMT) | 1.3 27 km | 120 km (75 mi) | 5km SSE of Pearblossom, CA | More | Map |
| Wed, Sep 15, 2021 (GMT) (7 earthquakes) | |||||
| Sep 15, 2021 4:11 pm (GMT -7) (Sep 15, 2021 23:11:21 GMT) | 1.5 5.9 km | 119 km (74 mi) | 14km WNW of Anza, CA | More | Map |
| Sep 15, 2021 1:27 pm (GMT -7) (Sep 15, 2021 20:27:25 GMT) | 1.7 2.8 km | 129 km (80 mi) | 5km SSE of Home Gardens, CA | More | Map |
| Sep 15, 2021 1:17 pm (GMT -7) (Sep 15, 2021 20:17:49 GMT) | 1.6 12 km | 105 km (65 mi) | 10km NW of Idyllwild, CA | More | Map |
| Sep 15, 2021 6:59 am (GMT -7) (Sep 15, 2021 13:59:34 GMT) | ? n/a | 161 km (100 mi) | 1.2 mi northeast of Garden Grove, Orange County, California, USA (unconfirmed) I FELT IT - 1 report | More | Map |
| Sep 15, 2021 3:01 am (GMT -7) (Sep 15, 2021 10:01:32 GMT) | 2.3 7.8 km | 126 km (78 mi) | 8km SSW of Pearblossom, CA 3 reports | More | Map |
| Sep 14, 2021 9:05 pm (GMT -7) (Sep 15, 2021 04:05:08 GMT) | 1.0 21 km | 115 km (71 mi) | 4km ESE of Aguanga, CA | More | Map |
| Sep 14, 2021 6:11 pm (GMT -7) (Sep 15, 2021 01:11:54 GMT) | 1.1 16 km | 119 km (74 mi) | 10km SW of Idyllwild, CA | More | Map |
| Tue, Sep 14, 2021 (GMT) (13 earthquakes) | |||||
| Sep 14, 2021 3:59 pm (GMT -7) (Sep 14, 2021 22:59:39 GMT) | 1.2 15 km | 136 km (85 mi) | 6km NE of Wildomar, CA | More | Map |
| Sep 14, 2021 2:36 pm (GMT -7) (Sep 14, 2021 21:36:26 GMT) | 2.9 8.5 km | 97 km (60 mi) | 10.8 mi north of Fontana, San Bernardino County, California, USA I FELT IT - 10 reports | More | Map |
| Sep 14, 2021 11:53 am (GMT -7) (Sep 14, 2021 18:53:58 GMT) | 1.1 12 km | 90 km (56 mi) | 5km NW of Cabazon, CA | More | Map |
| Sep 14, 2021 9:55 am (GMT -7) (Sep 14, 2021 16:55:23 GMT) | 1.2 15 km | 95 km (59 mi) | 3km SW of Redlands, CA | More | Map |
| Sep 14, 2021 9:10 am (GMT -7) (Sep 14, 2021 16:10:03 GMT) | 1.4 0.6 km | 104 km (65 mi) | 8km SW of Beaumont, CA | More | Map |
| Sep 14, 2021 7:20 am (GMT -7) (Sep 14, 2021 14:20:12 GMT) | 1.2 8.3 km | 72 km (45 mi) | 13km SSE of Big Bear Lake, CA | More | Map |
| Sep 14, 2021 6:46 am (GMT -7) (Sep 14, 2021 13:46:57 GMT) | 1.0 9.1 km | 72 km (45 mi) | 13km SSE of Big Bear Lake, CA | More | Map |
| Sep 14, 2021 6:35 am (GMT -7) (Sep 14, 2021 13:35:27 GMT) | 1.9 20 km | 86 km (53 mi) | 9km NNW of Cabazon, CA | More | Map |
| Sep 14, 2021 5:53 am (GMT -7) (Sep 14, 2021 12:53:08 GMT) | ? n/a | 174 km (108 mi) | 0.9 mi north of Huntington Beach, Orange County, California, USA (unconfirmed) I FELT IT - 1 report | More | Map |
| Sep 14, 2021 3:40 am (GMT -7) (Sep 14, 2021 10:40:56 GMT) | 1.8 15 km | 136 km (85 mi) | 5km NE of Wildomar, CA 1 report | More | Map |
| Sep 13, 2021 11:12 pm (GMT -7) (Sep 14, 2021 06:12:34 GMT) | 1.0 0.6 km | 106 km (66 mi) | 10km NE of Nuevo, CA | More | Map |
| Sep 13, 2021 8:34 pm (GMT -7) (Sep 14, 2021 03:34:19 GMT) | 1.4 13 km | 110 km (68 mi) | 4km E of San Jacinto, CA | More | Map |
| Sep 13, 2021 7:29 pm (GMT -7) (Sep 14, 2021 02:29:06 GMT) | 2.2 17 km | 93 km (58 mi) | 4km NE of Beaumont, CA | More | Map |
| Mon, Sep 13, 2021 (GMT) (11 earthquakes) | |||||
| Sep 13, 2021 4:23 pm (GMT -7) (Sep 13, 2021 23:23:41 GMT) | ? n/a | 139 km (86 mi) | 3.1 mi northeast of Murrieta, Riverside County, California, USA (unconfirmed) I FELT IT - 2 reports | More | Map |
| Sep 13, 2021 1:34 pm (GMT -7) (Sep 13, 2021 20:34:56 GMT) | 1.4 0.8 km | 135 km (84 mi) | Quarry Blast - 5km NNW of Azusa, CA | More | Map |
| Sep 13, 2021 9:46 am (GMT -7) (Sep 13, 2021 16:46:50 GMT) | 1.3 19 km | 133 km (83 mi) | 16km SE of Winchester, CA | More | Map |
| Sep 13, 2021 9:36 am (GMT -7) (Sep 13, 2021 16:36:48 GMT) | 1.1 1.4 km | 52 km (32 mi) | 9km NNW of Big Bear City, CA | More | Map |
| Sep 13, 2021 8:22 am (GMT -7) (Sep 13, 2021 15:22:59 GMT) | 1.0 17 km | 101 km (63 mi) | 2km SE of Loma Linda, CA | More | Map |
| Sep 13, 2021 3:04 am (GMT -7) (Sep 13, 2021 10:04:21 GMT) | 1.4 16 km | 97 km (60 mi) | 2km N of Colton, CA | More | Map |
| Sep 13, 2021 2:40 am (GMT -7) (Sep 13, 2021 09:40:12 GMT) | ? n/a | 135 km (84 mi) | 5.7 mi northeast of Murrieta, Riverside County, California, USA (unconfirmed) I FELT IT - 1 report | More | Map |
| Sep 13, 2021 12:09 am (GMT -7) (Sep 13, 2021 07:09:20 GMT) | 1.5 8.2 km | 55 km (34 mi) | 4km ENE of Big Bear City, CA | More | Map |
| Sep 12, 2021 11:26 pm (GMT -7) (Sep 13, 2021 06:26:12 GMT) | ? n/a | 156 km (97 mi) | 0.9 mi south of Fullerton, Orange County, California, USA (unconfirmed) I FELT IT - 2 reports | More | Map |
| Sep 12, 2021 10:24 pm (GMT -7) (Sep 13, 2021 05:24:22 GMT) | 1.5 10.7 km | 91 km (57 mi) | 7km ENE of Cabazon, CA | More | Map |
| Sep 12, 2021 5:05 pm (GMT -7) (Sep 13, 2021 00:05:13 GMT) | 1.2 12 km | 146 km (91 mi) | 2km NNW of Sierra Madre, CA | More | Map |
| Sun, Sep 12, 2021 (GMT) (8 earthquakes) | |||||
| Sep 12, 2021 8:02 am (GMT -7) (Sep 12, 2021 15:02:01 GMT) | 1.4 0.5 km | 116 km (72 mi) | 2km ESE of Nuevo, CA | More | Map |
| Sep 12, 2021 3:20 am (GMT -7) (Sep 12, 2021 10:20:10 GMT) | 1.1 7.9 km | 102 km (63 mi) | 4km N of Fontana, CA | More | Map |
| Sep 12, 2021 2:55 am (GMT -7) (Sep 12, 2021 09:55:05 GMT) | 1.0 2.3 km | 102 km (63 mi) | 4km N of Fontana, CA | More | Map |
| Sep 12, 2021 2:53 am (GMT -7) (Sep 12, 2021 09:53:27 GMT) | 1.6 6.7 km | 49 km (30 mi) | 4km S of Lucerne Valley, CA | More | Map |
| Sep 11, 2021 10:51 pm (GMT -7) (Sep 12, 2021 05:51:11 GMT) | 1.2 8.3 km | 97 km (60 mi) | 12km SSE of Anza, CA | More | Map |
| Sep 11, 2021 9:11 pm (GMT -7) (Sep 12, 2021 04:11:16 GMT) | 1.3 5.6 km | 121 km (75 mi) | 3km SSE of Mead Valley, CA | More | Map |
| Sep 11, 2021 9:08 pm (GMT -7) (Sep 12, 2021 04:08:57 GMT) | 1.1 10.7 km | 104 km (65 mi) | 7km S of Beaumont, CA | More | Map |
| Sep 11, 2021 6:21 pm (GMT -7) (Sep 12, 2021 01:21:18 GMT) | 1.1 10.7 km | 124 km (77 mi) | 6km WNW of Aguanga, CA | More | Map |
| Sat, Sep 11, 2021 (GMT) (9 earthquakes) | |||||
| Sep 11, 2021 4:42 pm (GMT -7) (Sep 11, 2021 23:42:16 GMT) | 1.5 0.5 km | 152 km (94 mi) | 13km ESE of Coto De Caza, CA | More | Map |
| Sep 11, 2021 2:37 pm (GMT -7) (Sep 11, 2021 21:37:13 GMT) | 1.1 4.9 km | 118 km (73 mi) | 12km W of Anza, CA | More | Map |
| Sep 11, 2021 7:58 am (GMT -7) (Sep 11, 2021 14:58:55 GMT) | 1.3 5.7 km | 127 km (79 mi) | 3km N of La Verne, CA | More | Map |
| Sep 11, 2021 12:36 am (GMT -7) (Sep 11, 2021 07:36:00 GMT) | 1.0 18 km | 88 km (55 mi) | 7km NNE of Banning, CA | More | Map |
| Sep 10, 2021 10:58 pm (GMT -7) (Sep 11, 2021 05:58:19 GMT) | 1.0 8.1 km | 140 km (87 mi) | 7km E of Temecula, CA | More | Map |
| Sep 10, 2021 10:04 pm (GMT -7) (Sep 11, 2021 05:04:16 GMT) | 1.5 6.8 km | 102 km (63 mi) | 4km NNE of Fontana, CA | More | Map |
| Sep 10, 2021 9:22 pm (GMT -7) (Sep 11, 2021 04:22:27 GMT) | 1.5 30 km | 145 km (90 mi) | 6km N of Trabuco Canyon, CA | More | Map |
| Sep 10, 2021 6:18 pm (GMT -7) (Sep 11, 2021 01:18:56 GMT) | 1.2 6.8 km | 102 km (63 mi) | 4km N of Fontana, CA | More | Map |
| Sep 10, 2021 6:17 pm (GMT -7) (Sep 11, 2021 01:17:44 GMT) | 2.4 5.8 km | 126 km (78 mi) | 4km N of La Verne, CA 7 reports | More | Map |
| Fri, Sep 10, 2021 (GMT) (6 earthquakes) | |||||
| Sep 10, 2021 1:36 pm (GMT -7) (Sep 10, 2021 20:36:09 GMT) | 1.0 13 km | 112 km (70 mi) | 10km S of Idyllwild, CA | More | Map |
| Sep 10, 2021 10:29 am (GMT -7) (Sep 10, 2021 17:29:40 GMT) | 2.1 2.2 km | 130 km (81 mi) | 5km SSE of Home Gardens, CA 2 reports | More | Map |
| Sep 10, 2021 9:06 am (GMT -7) (Sep 10, 2021 16:06:08 GMT) | 1.2 11 km | 103 km (64 mi) | 6km N of Fontana, CA | More | Map |
| Sep 10, 2021 8:49 am (GMT -7) (Sep 10, 2021 15:49:55 GMT) | 1.2 8.4 km | 127 km (79 mi) | 6km S of Littlerock, CA | More | Map |
| Sep 10, 2021 4:18 am (GMT -7) (Sep 10, 2021 11:18:59 GMT) | 1.2 15 km | 82 km (51 mi) | 12km NNE of Cabazon, CA | More | Map |
| Sep 10, 2021 3:45 am (GMT -7) (Sep 10, 2021 10:45:37 GMT) | 1.3 18 km | 96 km (60 mi) | 1km N of Loma Linda, CA | More | Map |
Estimated combined seismic energy released: 1.3 x 1010 joules (3.49 megawatt hours, equivalent to 3 tons of TNT) More info
