SummaryMapsTestimonies Medias Scientific data
AuthorINFO
Date and time2025-01-08 22:17:09.0 UTC
Latitude9.229
Longitude39.965
Depth10
Magnitude4.6 mb
RegionETHIOPIA
Latest update2025-01-09 07:37:42.5 UTC
rms1.41 s
N° phases used for the localisation297
N° stations used for the localisation180
Gap76.9 °
95% confidence ellipse
semi major9.90
semi minor5.90
Azimuth144 °
Location Typemanual
Download data for this event
Note: links can take up to 20 minutes from the earthquake to become available
NetworkcodeDistance°EvAzA/MPhasePick timeResidualTAuthor
IUFURI1.313255Pn2025-01-08 22:17:32.0-1.70TGFZ
IUFURI1.313255Sn2025-01-08 22:17:52.81.30TGFZ
GATD3.64651Pn2025-01-08 22:18:06.40.80TNEIR
GATD3.64651Pn2025-01-08 22:18:08.32.80TGFZ
GEDAMY6.85939Pn2025-01-08 22:18:50.30.40TNEIR
IIMBAR13.425224Pn2025-01-08 22:20:20.40.60TGSRC
IIMBAR13.425224P2025-01-08 22:20:20.5-8.80GSRC
IIRAYN15.18220Pn2025-01-08 22:20:45.31.70TBUC
IIRAYN15.18220P2025-01-08 22:20:45.4-3.30TBUC
IIRAYN15.18220Pn2025-01-08 22:20:46.02.40TBEO
IIRAYN15.18220P2025-01-08 22:20:47.5-1.20TGFZ
GEEIL20.886348P2025-01-08 22:21:51.1-0.30TMCSM
GEEIL20.886348Pn2025-01-08 22:21:51.2-2.70MCSM
IIUOSS22.00543P2025-01-08 22:22:02.6-0.90TBEO
IIUOSS22.00543P2025-01-08 22:22:02.6-0.90TGFZ
IIUOSS22.00543P2025-01-08 22:22:02.8-0.70TGSRC
IIUOSS22.00543pP2025-01-08 22:22:02.9-3.70TGSRC
IIUOSS22.00543P2025-01-08 22:22:03.40.00TNEIR
IIUOSS22.00543P2025-01-08 22:22:07.43.90TSC4
QMMBUZ22.533166P2025-01-08 22:22:10.41.40TNEIR
GEBALJ23.112351P2025-01-08 22:22:18.73.60TGFZ
GEBALJ23.112351P2025-01-08 22:22:19.84.60TSC4
KOCEYT27.936353P2025-01-08 22:23:00.20.70TNEIR
KOGAZ27.946355P2025-01-08 22:23:00.30.60TNEIR
TUAKO28.419352P2025-01-08 22:23:04.40.60TBUC
TUAKO28.419352P2025-01-08 22:23:04.40.60TBUC
TUKEPZ28.588346P2025-01-08 22:23:06.20.90TBUC
TUKEPZ28.588346P2025-01-08 22:23:06.20.90TBUC
KOELL28.891343P2025-01-08 22:23:09.61.50TNEIR
KOSARI29.241354P2025-01-08 22:23:12.31.00TNEIR
KODARE29.315356P2025-01-08 22:23:12.60.80TNEIR
KOBNN29.742354P2025-01-08 22:23:16.71.00TNEIR
KOBNN29.742354P2025-01-08 22:23:19.43.70TSC4
GEARPR29.787357P2025-01-08 22:23:17.41.30TNEIR
GEDA30.130262P2025-01-08 22:23:33.914.80SC4
TUKIRS30.281351P2025-01-08 22:23:22.31.90TBUC
TUKIRS30.281351pP2025-01-08 22:23:22.4-1.40TBUC
TUKKUL30.491349P2025-01-08 22:23:23.91.70TGFZ
A2KCHK30.6288P2025-01-08 22:23:24.81.20TNEIR
IMBR13130.904350P2025-01-08 22:23:25.4-0.60TMCSM
IMBRTR30.904350P2025-01-08 22:23:27.61.60TGSRC
IMBRTR30.904350pP2025-01-08 22:23:27.7-1.60TGSRC
IUGNI31.0987P2025-01-08 22:23:26.9-0.70TMCSM
IUGNI31.0987P2025-01-08 22:23:26.9-0.70TMCSM
IUGNI31.0987P2025-01-08 22:23:29.31.60TNEIR
IUANTO31.190349P2025-01-08 22:23:28.60.20TBUC
IUANTO31.190349pP2025-01-08 22:23:28.7-3.10TBUC
IUANTO31.190349P2025-01-08 22:23:29.51.10TNEIR
IUANTO31.190349P2025-01-08 22:23:30.42.00TBEO
IUANTO31.190349P2025-01-08 22:23:30.42.00TGFZ
TUBORA31.696346P2025-01-08 22:23:33.00.10TNEIR
A2ZRSH31.8175P2025-01-08 22:23:35.81.80TNEIR
KOMDUB32.090347P2025-01-08 22:23:37.41.10TNEIR
TUILGA32.188351P2025-01-08 22:23:38.51.10TNEIR
TUSAHE32.530347P2025-01-08 22:23:41.61.50TBUC
TUSAHE32.530347pP2025-01-08 22:23:41.7-1.80TBUC
TUNEV32.642342P2025-01-08 22:23:42.11.10TNEIR
KOEZN32.825340P2025-01-08 22:23:44.01.40TBUC
KOEZN32.825340P2025-01-08 22:23:44.01.40TBUC
IRZEI33.6105P2025-01-08 22:23:49.2-0.30TGSRC
IRZEI33.6105P2025-01-08 22:23:49.2-0.30TGSRC
GOCHBG33.7183P2025-01-08 22:23:51.50.80TNEIR
HLRDO34.274340P2025-01-08 22:23:58.73.50TSC4
HTLIT34.476336P2025-01-08 22:23:57.50.50TNEIR
IIKIV34.6893P2025-01-08 22:24:00.61.60TGSRC
IIKIV34.6893pP2025-01-08 22:24:00.7-1.70TGSRC
IIKIV34.6893P2025-01-08 22:24:01.32.40TGFZ
HTKNT35.226337P2025-01-08 22:24:03.5-0.10TBEO
HTGRG35.240337P2025-01-08 22:24:03.5-0.20TBEO
BSPLD35.433340P2025-01-08 22:24:06.71.40TBEO
GTAM35.663296P2025-01-08 22:24:08.20.60TBEO
GTAM35.663296P2025-01-08 22:24:09.51.90TGFZ
GTAM35.663296P2025-01-08 22:24:13.45.80SC4
BSVTS136.356339P2025-01-08 22:24:14.00.60TBEO
MNVTS36.369339P2025-01-08 22:24:13.90.40TGFZ
MNVTS36.369339P2025-01-08 22:24:14.10.60TBUC
MNVTS36.369339pP2025-01-08 22:24:14.2-2.70TBUC
ROTLCR37.109347P2025-01-08 22:24:19.2-0.30TBUC
ROTLCR37.109347P2025-01-08 22:24:19.2-0.30TBUC
SJZAPS37.156339P2025-01-08 22:24:20.20.10TBEO
ROCFR37.258346P2025-01-08 22:24:21.30.50TGFZ
ROCFR37.258346P2025-01-08 22:24:21.70.90TBUC
ROCFR37.258346P2025-01-08 22:24:21.70.90TBUC
BSBLKB37.447339P2025-01-08 22:24:22.3-0.30TBUC
BSBLKB37.447339pP2025-01-08 22:24:22.4-3.50TBUC
SJSELS37.663337P2025-01-08 22:24:24.0-0.40TBEO
MNPDG37.755335P2025-01-08 22:24:25.50.50TMCSM
MNPDG37.755335P2025-01-08 22:24:25.50.50TMCSM
Y8RO44A37.929344P2025-01-08 22:24:27.71.10TBUC
Y8RO44A37.929344P2025-01-08 22:24:27.71.10TBUC
ROMLR38.108344P2025-01-08 22:24:28.70.50TBUC
ROMLR38.108344P2025-01-08 22:24:28.70.50TBUC
ROMLR38.108344P2025-01-08 22:24:28.90.70TNEIR
ROMLR38.108344P2025-01-08 22:24:30.01.80TBEO
ROMLR38.108344P2025-01-08 22:24:30.01.80TGFZ
Y8RO05A38.114342P2025-01-08 22:24:28.70.60TBUC
Y8RO05A38.114342P2025-01-08 22:24:28.70.60TBUC
ROMTUR38.118343P2025-01-08 22:24:29.10.80TBUC
ROMTUR38.118343pP2025-01-08 22:24:29.2-2.50TBUC
ROVRI38.248345P2025-01-08 22:24:28.7-0.50TMCSM
ROVRI38.248345P2025-01-08 22:24:28.7-0.50TMCSM
ROVRI38.248345P2025-01-08 22:24:30.51.30TBUC
ROVRI38.248345P2025-01-08 22:24:30.51.30TBUC
ROVRI38.248345P2025-01-08 22:24:30.81.60TGFZ
ROPLOR38.254345P2025-01-08 22:24:30.51.20TBUC
ROPLOR38.254345P2025-01-08 22:24:30.51.20TBUC
ROPLOR138.256345P2025-01-08 22:24:31.11.70TGFZ
ROVOIR38.310343P2025-01-08 22:24:30.40.60TBUC
ROVOIR38.310343P2025-01-08 22:24:30.40.60TBUC
ROVOIR38.310343P2025-01-08 22:24:30.40.60TGFZ
ROARR38.367343P2025-01-08 22:24:30.70.40TBUC
ROARR38.367343P2025-01-08 22:24:30.70.40TBUC
ROARR38.367343P2025-01-08 22:24:30.70.40TGFZ
SJGRUS38.392337P2025-01-08 22:24:30.4-0.10TGFZ
Y8RO11A38.596340P2025-01-08 22:24:32.30.10TBUC
Y8RO11A38.596340pP2025-01-08 22:24:32.4-3.20TBUC
ROHERR38.639340P2025-01-08 22:24:32.90.40TBUC
ROHERR38.639340P2025-01-08 22:24:32.90.40TBUC
ROMDVR38.795339P2025-01-08 22:24:33.7-0.20TBUC
ROMDVR38.795339P2025-01-08 22:24:33.7-0.20TBUC
MNDIVS38.846337P2025-01-08 22:24:35.00.70TNEIR
MNDIVS38.846337P2025-01-08 22:24:37.53.10TSC4
ROGZR38.970341P2025-01-08 22:24:35.50.10TBUC
ROGZR38.970341P2025-01-08 22:24:35.50.10TBUC
ROGZR38.970341P2025-01-08 22:24:35.80.40TBEO
Y8RO18A39.042341P2025-01-08 22:24:36.50.60TBUC
Y8RO18A39.042341P2025-01-08 22:24:36.50.60TBUC
Y8RO27A39.044346P2025-01-08 22:24:37.21.30TBUC
Y8RO27A39.044346P2025-01-08 22:24:37.21.30TBUC
SJVRSS39.228339P2025-01-08 22:24:37.3-0.20TBEO
TJCHGR39.31637P2025-01-08 22:24:39.81.40TNEIR
RODEV39.369341P2025-01-08 22:24:40.01.40TGFZ
IIJZAX39.44334P2025-01-08 22:24:40.51.20TGSRC
IIJZAX39.44334P2025-01-08 22:24:40.51.20TGSRC
ROSURR39.504340P2025-01-08 22:24:39.6-0.20TBUC
ROSURR39.504340pP2025-01-08 22:24:39.7-3.50TBUC
ROBZS39.549340P2025-01-08 22:24:39.6-0.50TGFZ
ROBZS39.549340P2025-01-08 22:24:39.8-0.40TBUC
ROBZS39.549340P2025-01-08 22:24:39.9-0.30TBUC
ROBZS39.549340P2025-01-08 22:24:39.9-0.30TBEO
MNBZS39.549340P2025-01-08 22:24:40.40.30TNEIR
SJFRGS39.810338P2025-01-08 22:24:44.01.70TGFZ
Y8RO25A39.885340P2025-01-08 22:24:43.70.80TBUC
Y8RO25A39.885340P2025-01-08 22:24:43.70.80TBUC
ROCJR39.892342P2025-01-08 22:24:44.11.00TBUC
ROCJR39.892342pP2025-01-08 22:24:44.2-2.30TBUC
ROMARR40.004342P2025-01-08 22:24:44.10.00TBUC
ROMARR40.004342pP2025-01-08 22:24:44.2-3.30TBUC
MDSORM40.009348P2025-01-08 22:24:43.9-0.10TBUC
MDSORM40.009348P2025-01-08 22:24:43.9-0.10TBUC
ROARCR40.010343P2025-01-08 22:24:46.22.30TGFZ
RODRGR40.234342P2025-01-08 22:24:46.60.70TGFZ
RODRGR40.234342P2025-01-08 22:24:46.60.70TBUC
RODRGR40.234342P2025-01-08 22:24:46.80.90TBUC
RODRGR40.234342P2025-01-08 22:24:47.01.10TBEO
GTBOSA40.252200P2025-01-08 22:24:46.0-0.10TMCSM
GTBOSA40.252200P2025-01-08 22:24:46.0-0.10TMCSM
GTBOSA40.252200P2025-01-08 22:24:46.50.40TNEIR
ROBURAR40.290345P2025-01-08 22:24:47.10.70TBUC
ROBURAR40.290345P2025-01-08 22:24:47.20.70TBUC
ROBUR3140.290345P2025-01-08 22:24:46.60.10TMCSM
ROBUR3140.290345P2025-01-08 22:24:47.10.70TNEIR
Y8RO37A40.324344P2025-01-08 22:24:47.71.10TBUC
Y8RO37A40.324344P2025-01-08 22:24:47.71.10TBUC
QZINDER40.38112P2025-01-08 22:24:47.80.90TNEIR
IIPALK40.39090P2025-01-08 22:24:49.82.40TGFZ
MNBLY40.517335P2025-01-08 22:24:50.72.50TGFZ
UDKPD40.830346P2025-01-08 22:24:49.9-0.80TMCSM
IRKSV40.943345P2025-01-08 22:24:52.50.80TGFZ
HUMORH41.141337P2025-01-08 22:24:53.50.20TGFZ
KRBTK41.20037P2025-01-08 22:24:55.41.40TNEIR
HUKOVH41.243337P2025-01-08 22:24:55.81.70TGFZ
QZAKST41.36224P2025-01-08 22:24:55.70.60TNEIR
QZAKST41.36224P2025-01-08 22:24:59.14.00TSC4
HUTRPA41.481342P2025-01-08 22:24:56.30.20TGFZ
UDLUBAR41.827348P2025-01-08 22:24:58.6-0.30TMCSM
IRUZH42.002342P2025-01-08 22:24:59.3-1.10TMCSM
UAGRDS42.080350P2025-01-08 22:25:02.01.00TMCSM
GEPSZ42.140340P2025-01-08 22:25:01.5-0.10TBUC
GEPSZ42.140340P2025-01-08 22:25:01.5-0.10TBUC
GEPSZ42.140340P2025-01-08 22:25:01.70.10TNEIR
GEPSZ42.140340P2025-01-08 22:25:01.70.10TGFZ
GEPSZ42.140340P2025-01-08 22:25:02.00.40TBEO
GEPSZ42.140340P2025-01-08 22:25:03.41.90TSC4
SKKOLS42.278343P2025-01-08 22:25:05.12.50TGFZ
IMAKBB42.298350P2025-01-08 22:25:02.4-0.30TMCSM
IMAKBB42.298350P2025-01-08 22:25:02.4-0.30TMCSM
IUKIEV42.298350P2025-01-08 22:25:02.4-0.30TNEIR
IUKIEV42.298350P2025-01-08 22:25:02.6-0.10TGFZ
IUKIEV42.298350P2025-01-08 22:25:03.00.30TBUC
IUKIEV42.298350P2025-01-08 22:25:03.00.30TBUC
IMAKBB42.298350P2025-01-08 22:25:03.00.30TGSRC
IMAKBB42.298350P2025-01-08 22:25:03.00.30TGSRC
IUKIEV42.298350P2025-01-08 22:25:04.82.10TSC4
HUMPLH42.356337P2025-01-08 22:25:03.90.60TGFZ
KROHH42.66538P2025-01-08 22:25:06.30.40TGFZ
PLKWP42.781344P2025-01-08 22:25:08.41.70TGFZ
UAPIDL42.805349P2025-01-08 22:25:06.5-0.30TMCSM
UAPIDL42.805349P2025-01-08 22:25:06.5-0.30TMCSM
KRARK42.98336P2025-01-08 22:25:08.70.10TNEIR
IMKKAR43.03033P2025-01-08 22:25:09.00.20TNEIR
QZFDRN43.03411P2025-01-08 22:25:09.10.50TNEIR
OEOBKA43.036334P2025-01-08 22:25:09.30.40TGFZ
HUSOP43.156337P2025-01-08 22:25:08.1-1.60TGFZ
OXDRE43.170333P2025-01-08 22:25:10.20.20TGFZ
IMABK3143.26819P2025-01-08 22:25:10.80.20TNEIR
IMABKAR43.26819P2025-01-08 22:25:10.80.20TNEIR
PLNIE43.307341P2025-01-08 22:25:13.82.80TGFZ
OXCIMO43.817332P2025-01-08 22:25:15.80.60TGFZ
OEKBA43.998334P2025-01-08 22:25:17.30.50TGFZ
CZMAUC44.088339P2025-01-08 22:25:17.60.30TGFZ
PLOJC44.168341P2025-01-08 22:25:19.01.10TGFZ
PLOJC44.168341P2025-01-08 22:25:19.01.10TNEIR
OEMOA44.208335P2025-01-08 22:25:18.50.20TGFZ
OEMOA44.208335P2025-01-08 22:25:19.00.70TBEO
M1SUPC44.348339P2025-01-08 22:25:21.52.20TGFZ
CZKRUC44.352338P2025-01-08 22:25:19.40.00TNEIR
CZOKC44.378340P2025-01-08 22:25:19.90.40TGFZ
GTDBIC44.489270P2025-01-08 22:25:20.5-0.20TNEIR
GTDBIC44.489270P2025-01-08 22:25:21.30.60TGFZ
CZMORC44.535339P2025-01-08 22:25:20.5-0.40TBUC
CZMORC44.535339P2025-01-08 22:25:20.5-0.40TBUC
GEMORC44.535339P2025-01-08 22:25:20.7-0.20TGFZ
GEMORC44.535339P2025-01-08 22:25:20.7-0.20TBEO
GEMORC44.535339P2025-01-08 22:25:22.51.60TSC4
M1LUKC44.632339P2025-01-08 22:25:22.10.50TGFZ
M1MUVC44.647339P2025-01-08 22:25:21.7-0.10TGFZ
CZSTAC44.740337P2025-01-08 22:25:22.1-0.40TGFZ
M1LIPC44.765339P2025-01-08 22:25:24.21.50TGFZ
CZKRLC45.052339P2025-01-08 22:25:22.8-2.20TGFZ
M1RYBC45.089338P2025-01-08 22:25:25.40.20TGFZ
CHMUGIO45.163330P2025-01-08 22:25:28.72.80TGFZ
GRGEC745.212336P2025-01-08 22:25:25.7-0.60TGFZ
IMGEC2A45.225336P2025-01-08 22:25:25.8-0.70TMCSM
IMGEC2A45.225336pP2025-01-08 22:25:25.9-4.00TMCSM
GRGEC245.225336P2025-01-08 22:25:26.2-0.30TGFZ
IMGERES45.225336P2025-01-08 22:25:26.0-0.40TNEIR
M1PIVO45.228339P2025-01-08 22:25:26.50.10TGFZ
MNTUE45.398330P2025-01-08 22:25:32.14.10TGFZ
CZDPC45.420339P2025-01-08 22:25:27.4-0.50TGFZ
MNDPC45.445339P2025-01-08 22:25:27.2-0.90TNEIR
CZZVC45.500337P2025-01-08 22:25:28.2-0.30TGFZ
CZKHC45.500336P2025-01-08 22:25:28.3-0.30TNEIR
CZKHC45.500336P2025-01-08 22:25:29.81.30TGFZ
CZKHC45.500336P2025-01-08 22:25:30.01.40TGSRC
CZKHC45.500336P2025-01-08 22:25:30.01.40TGSRC
CZUPC45.686339P2025-01-08 22:25:28.0-2.00TGFZ
FROGAG45.701327P2025-01-08 22:25:30.70.40TGFZ
OEDAVA45.725332P2025-01-08 22:25:30.0-0.50TGFZ
GRWET45.796335P2025-01-08 22:25:31.00.20TGFZ
PLKSP45.866339P2025-01-08 22:25:31.3-0.10TGFZ
GRUBR45.904332P2025-01-08 22:25:31.3-0.50TGFZ
GRGRC346.145334P2025-01-08 22:25:33.5-0.20TGFZ
GRGRC246.218334P2025-01-08 22:25:33.7-0.50TGFZ
QZBTLS46.22133P2025-01-08 22:25:35.10.90TSC4
GRGRC146.253334P2025-01-08 22:25:34.2-0.30TGFZ
GRGRB546.274334P2025-01-08 22:25:35.40.70TGFZ
GRGRB246.399335P2025-01-08 22:25:36.50.90TGFZ
CHSLE46.724331P2025-01-08 22:25:37.3-0.90TGFZ
SXTANN46.957336P2025-01-08 22:25:40.40.40TGFZ
CHBOURR47.081330P2025-01-08 22:25:40.8-0.30TGFZ
IMMD3147.465307P2025-01-08 22:25:44.60.40TNEIR
IMMD0147.468307P2025-01-08 22:25:45.31.00TNEIR
GRMOX47.476336P2025-01-08 22:25:45.51.50TGFZ
GRTNS48.503333P2025-01-08 22:25:51.6-0.50TGFZ
FRATE48.941321P2025-01-08 22:25:55.70.30TGFZ
IIARTI49.20913P2025-01-08 22:25:56.5-0.90TNEIR
GRKAST49.230334P2025-01-08 22:25:58.20.60TGFZ
IRKIRV49.7746P2025-01-08 22:26:03.01.40TGSRC
IRKIRV49.7746P2025-01-08 22:26:03.01.40TGSRC
GRBUG49.904334P2025-01-08 22:26:04.61.90TGFZ
IIBORK50.11323P2025-01-08 22:26:04.40.10TGSRC
IIBORK50.11323P2025-01-08 22:26:04.40.10TGSRC
IIBORK50.11323P2025-01-08 22:26:06.22.00TSC4
GEIBBN50.314335P2025-01-08 22:26:06.10.30TGFZ
IMMKAR51.89836P2025-01-08 22:26:17.2-0.60TNEIR
KZMKAR51.89836P2025-01-08 22:26:17.2-0.60TGSRC
KZMKAR51.89836pP2025-01-08 22:26:17.4-3.90TGSRC
IMMK3151.89836P2025-01-08 22:26:16.3-1.50TMCSM
IMMK3151.89836P2025-01-08 22:26:17.6-0.20TGSRC
IMMK3151.89836pP2025-01-08 22:26:17.7-3.60TGSRC
IRKURBB52.09230P2025-01-08 22:26:17.8-1.40TMCSM
RMSIM52.17972P2025-01-08 22:24:12.3-999.00GSRC
RMSIM52.17972P2025-01-08 22:24:12.4-999.00GSRC
IIKURK52.19530P2025-01-08 22:26:19.7-0.20TGFZ
IIKURK52.19530P2025-01-08 22:26:19.7-0.20TNEIR
IIKURK52.19530P2025-01-08 22:26:20.20.30TGSRC
IIKURK52.19530P2025-01-08 22:26:20.20.30TGSRC
IIKURK52.19530P2025-01-08 22:26:20.40.50TBEO
IIKURK52.19530P2025-01-08 22:26:21.71.80TSC4
IRDGZ56.33235P2025-01-08 22:26:50.0-0.30TGSRC
IRDGZ56.33235P2025-01-08 22:26:50.0-0.30TGSRC
IMZALV57.17030P2025-01-08 22:26:55.2-0.80TGSRC
IMZALV57.17030P2025-01-08 22:26:55.2-0.80TGSRC
IMZALV57.17030P2025-01-08 22:26:55.2-0.80TNEIR
IMZAA0B57.17030P2025-01-08 22:26:54.2-1.80TMCSM
IMNRIK67.31616P2025-01-08 22:28:02.2-1.80TMCSM
IMNRIK67.31616P2025-01-08 22:28:02.9-1.00TNEIR
IMSONA067.44642P2025-01-08 22:28:03.4-1.80TMCSM
IMSONA067.44642P2025-01-08 22:28:03.4-1.80TMCSM
ICENH67.79461P2025-01-08 22:28:06.1-1.30TMCSM
ICENH67.79461pP2025-01-08 22:28:06.2-4.80TMCSM
IUTIXI80.91319P2025-01-08 22:29:25.42.00TSC4