Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 28-12-2021 and time 16:23:51 (Italy) in region 3 km SW Amatrice (RI)

A magnitude ML 0.8 earthquake occured in region: 3 km SW Amatrice (RI), on

  • 28-12-2021 15:23:51 (UTC)
  • 28-12-2021 16:23:51 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.6070, 13.2700 at 13 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Amatrice RI 3 2657 2657
Cittareale RI 9 482 3139
Montereale AQ 9 2581 5720
Campotosto AQ 10 542 6262
Capitignano AQ 10 665 6927
Accumoli RI 10 667 7594
Borbona RI 15 617 8211
Cagnano Amiterno AQ 17 1369 9580
Posta RI 17 694 10274
Barete AQ 17 737 11011
Crognaleto TE 18 1297 12308
Arquata del Tronto AP 19 1178 13486
Pizzoli AQ 19 4326 17812
Cortino TE 20 656 18468

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NW of L'Aquila (69753 inhabitants)
36 Km W of Teramo (54892 inhabitants)
51 Km E of Terni (111501 inhabitants)
60 Km SE of Foligno (57155 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
79 Km W of Chieti (51815 inhabitants)
79 Km W of Pescara (121014 inhabitants)
81 Km NE of Guidonia Montecelio (88673 inhabitants)
81 Km NE of Tivoli (56533 inhabitants)
91 Km SE of Perugia (166134 inhabitants)
98 Km E of Viterbo (67173 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 0.8 2021-12-28
15:23:51		 42.6072 13.2697 13 2021-12-28
15:39:02		 Sala Sismica INGV-Roma 99080741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-28 15:23:51 ± 0.13
Latitude 42.6072 ± 0.0081
Longitude 13.2697 ± 0.0086
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 99080741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 818
Semi-minor axis of confidence ellipse (meter) 436
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 345
Circular confidence region, given by single value of horizontal uncertainty (meter) 820.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31027
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 11
Type of magnitude ML
Reference to an origin 99080741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-28 15:39:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
MN.KLV.HHZ. 2021-12-28T15:25:51.81 3.0 negative manual Pn 4.57 0
IV.GALF.HHZ. 2021-12-28T15:25:16.72 3.0 negative manual Pg 13.83 0
IV.HAGA.HHZ. 2021-12-28T15:25:14.19 3.0 undecidable manual Pn 3.92 0
IV.MILN.HNZ. 2021-12-28T15:25:12.88 3.0 undecidable manual Sn 0.42 0
IV.CORL.HHZ. 2021-12-28T15:25:10.54 3.0 negative manual Pg 12.49 0
IV.ZEN8.EHZ. 2021-12-28T15:24:55.28 3.0 undecidable manual Sn -3.87 0
GU.ENR.HHZ. 2021-12-28T15:24:49.97 3.0 undecidable manual Pg 10.54 0
IV.BAG8.HNZ. 2021-12-28T15:24:34.33 3.0 undecidable manual Pg 6.77 0
IV.ZEN8.EHZ. 2021-12-28T15:24:28.21 3.0 undecidable manual Pg 4.13 0
IV.NRCA.HHZ. 2021-12-28T15:24:01.02 0.6 undecidable manual S 333 28.1496 97 -0.3 45
IV.TERO.HHZ. 2021-12-28T15:24:00.64 0.3 undecidable manual S 86 27.3504 98 -0.47 66
IV.LNSS.HHE. 2021-12-28T15:23:58.65 0.6 undecidable manual S 269 18.7701 106 -0.21 47
IV.MC2.EHN. 2021-12-28T15:23:58.54 0.6 undecidable manual P 349 34.4433 95 0.48 44
IV.MMO1.EHZ. 2021-12-28T15:23:57.31 1.0 undecidable manual P 8 32.745 96 -0.5 21
IV.NRCA.HHZ. 2021-12-28T15:23:57.02 0.1 undecidable manual P 333 28.1496 97 -0.08 94
IV.TERO.HHZ. 2021-12-28T15:23:56.80 0.6 undecidable manual P 86 27.3504 98 -0.17 46
IV.RM33.EHZ. 2021-12-28T15:23:56.90 0.6 undecidable manual S 203 11.7771 125 -0.28 47
IV.MTRA.EHE. 2021-12-28T15:23:56.08 0.1 undecidable manual P 32 19.5693 105 0.28 93
IV.CAMP.HHZ. 2021-12-28T15:23:55.57 0.1 undecidable manual P 125 13.875 118 0.6 86
IV.LNSS.HHE. 2021-12-28T15:23:55.68 0.1 undecidable manual P 269 18.7701 106 0 97
IV.SMA1.EHZ. 2021-12-28T15:23:55.84 0.6 undecidable manual S 64 5.994 149 -0.26 48
IV.RM33.EHZ. 2021-12-28T15:23:54.80 0.3 positive manual P 203 11.7771 125 0.1 73
IV.SMA1.EHZ. 2021-12-28T15:23:54.05 0.1 negative manual P 64 5.994 149 -0.03 100
IV.PE3.EHZ. 2021-12-28T15:23:49.61 3.0 positive manual P -0.64 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHN. ML:0.7 0.000051157065 0.2176 AML other m 2021-12-28T15:23:57.21
IV.RM33.EHE. ML:0.8 0.000056149999999999996 0.16 AML other m 2021-12-28T15:23:57.72
IV.SMA1.EHE. ML:0.9 0.000098854235 0.192 AML other m 2021-12-28T15:23:55.96
IV.SMA1.EHN. ML:0.6 0.0000425333 0.1152 AML other m 2021-12-28T15:23:55.85
IV.RM33.HNE. ML:1.2 0.00014571839 0.64 AML other m 2021-12-28T15:24:11.45
IV.RM33.HNN. ML:1.1 0.00012857464999999998 0.9088 AML other m 2021-12-28T15:24:12.99
IV.TERO.HHE. ML:1.6 0.00020839560000000001 0.5504 AML other m 2021-12-28T15:24:08.93
IV.TERO.HHN. ML:0.6 0.000019028669999999998 0.1408 AML other m 2021-12-28T15:24:00.67
IV.NRCA.HHE. ML:0.5 0.000016673545 0.1024 AML other m 2021-12-28T15:24:02.11
IV.NRCA.HHN. ML:0.5 0.00001444299 0.1536 AML other m 2021-12-28T15:24:01.43
IV.NRCA.HNE. ML:1.4 0.000107792725 0.7808 AML other m 2021-12-28T15:24:09.71
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download