Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 20-12-2023 and time 05:44:31 (UTC) in region 6 km SW Accumoli (RI)

A magnitude ML 1.5 earthquake occured in region: 6 km SW Accumoli (RI), on

  • 20-12-2023 05:44:31 (UTC)
  • 20-12-2023 06:44:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.6510, 13.2160 at 12 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Accumoli RI 6 667 667
Cittareale RI 6 482 1149
Amatrice RI 7 2657 3806
Montereale AQ 14 2581 6387
Arquata del Tronto AP 15 1178 7565
Capitignano AQ 16 665 8230
Campotosto AQ 16 542 8772
Borbona RI 17 617 9389
Posta RI 17 694 10083
Cascia PG 18 3217 13300
Norcia PG 19 4957 18257

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km NW of L'Aquila (69753 inhabitants)
40 Km W of Teramo (54892 inhabitants)
48 Km E of Terni (111501 inhabitants)
54 Km SE of Foligno (57155 inhabitants)
78 Km W of Montesilvano (53738 inhabitants)
83 Km NE of Guidonia Montecelio (88673 inhabitants)
84 Km NE of Tivoli (56533 inhabitants)
84 Km SE of Perugia (166134 inhabitants)
84 Km W of Pescara (121014 inhabitants)
85 Km W of Chieti (51815 inhabitants)
95 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 1.5 2023-12-20
05:44:31		 42.6512 13.2157 12 2023-12-20
05:50:57		 Sala Sismica INGV-Roma 124154051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-20 05:44:31 ± 0.07
Latitude 42.6512 ± 0.0036
Longitude 13.2157 ± 0.0037
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 124154051

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 324
Semi-minor axis of confidence ellipse (meter) 158
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 332
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.42088
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 54
Type of magnitude ML
Reference to an origin 124154051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-20 05:50:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MCI.EHZ. 2023-12-20T05:45:09.50 3.0 undecidable manual S -0.66 0
IV.CESI.HHZ. 2023-12-20T05:44:46.77 0.6 undecidable manual S 327 46.7199 92 0.33 45
IV.MF5.EHZ. 2023-12-20T05:44:45.59 0.6 undecidable manual S 28 42.3243 92 0.32 45
IV.GIGS.HHZ. 2023-12-20T05:44:43.52 0.3 undecidable manual S 127 36.5412 92 -0.21 71
IV.ASSB.HHZ. 2023-12-20T05:44:43.20 3.0 positive manual P 0.29 0
IV.VCEL.EHZ. 2023-12-20T05:44:42.68 3.0 positive manual P 0.6 0
IV.MML1.EHZ. 2023-12-20T05:44:42.23 3.0 positive manual P 0.5 0
IV.TERO.HNZ. 2023-12-20T05:44:42.18 0.3 undecidable manual S 96 31.8459 93 -0.3 70
IV.OFFI.HHZ. 2023-12-20T05:44:41.60 3.0 negative manual P 0.69 0
IV.MMO1.EHZ. 2023-12-20T05:44:41.79 0.3 undecidable manual S 18 28.9488 94 0.07 73
IV.MOMA.HHZ. 2023-12-20T05:44:41.68 3.0 positive manual P 0.12 0
IV.CESI.HHZ. 2023-12-20T05:44:40.51 0.6 undecidable manual P 327 46.7199 92 0.38 44
IV.GAVE.EHZ. 2023-12-20T05:44:40.94 0.3 undecidable manual S 280 26.6511 94 -0.15 72
IV.CESX.HHZ. 2023-12-20T05:44:40.86 3.0 negative manual P 0.02 0
IV.GUMA.HHZ. 2023-12-20T05:44:40.66 3.0 positive manual P 0.21 0
IV.NRCA.HHZ. 2023-12-20T05:44:39.37 0.3 undecidable manual S 338 21.867 97 -0.45 68
IV.FDMO.HHZ. 2023-12-20T05:44:39.93 3.0 negative manual P -0.04 0
IV.MF5.EHZ. 2023-12-20T05:44:39.96 0.6 negative manual P 28 42.3243 92 0.51 43
IV.FIAM.HHZ. 2023-12-20T05:44:39.62 3.0 negative manual P 0.31 0
IV.CAMP.HHZ. 2023-12-20T05:44:39.35 0.3 undecidable manual S 129 20.3685 98 -0.07 75
IV.CSP1.EHZ. 2023-12-20T05:44:39.95 3.0 negative manual P -0.84 0
IV.LNSS.HHZ. 2023-12-20T05:44:38.03 0.3 undecidable manual S 250 15.2736 107 -0.07 75
IV.RM33.EHZ. 2023-12-20T05:44:38.14 0.3 undecidable manual S 180 15.7731 106 -0.09 75
IV.GIGS.HHZ. 2023-12-20T05:44:38.51 0.3 undecidable manual P 127 36.5412 92 -0.06 73
IV.MTRA.HNZ. 2023-12-20T05:44:38.58 0.3 undecidable manual S 52 18.87 100 -0.44 69
IV.TERO.HNZ. 2023-12-20T05:44:37.75 0.3 negative manual P 96 31.8459 93 -0.1 73
IV.GAVE.EHZ. 2023-12-20T05:44:37.00 0.1 positive manual P 280 26.6511 94 -0.04 99
IV.MMO1.EHZ. 2023-12-20T05:44:37.43 0.6 undecidable manual P 18 28.9488 94 0.03 49
IV.CAMP.HHZ. 2023-12-20T05:44:36.23 0.6 undecidable manual P 129 20.3685 98 0.15 48
IV.NRCA.HHZ. 2023-12-20T05:44:36.24 0.1 negative manual P 338 21.867 97 -0.07 99
IV.SMA1.EHZ. 2023-12-20T05:44:36.99 0.3 undecidable manual S 103 9.9789 127 0.14 75
IV.LNSS.HHZ. 2023-12-20T05:44:35.38 0.1 positive manual P 250 15.2736 107 0.06 100
IV.RM33.EHZ. 2023-12-20T05:44:35.48 0.1 positive manual P 180 15.7731 106 0.09 99
IV.MTRA.HNZ. 2023-12-20T05:44:35.86 0.3 undecidable manual P 52 18.87 100 0.01 75
IV.SMA1.EHZ. 2023-12-20T05:44:34.82 0.1 positive manual P 103 9.9789 127 0.22 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:2.2 0.0017871299999999998 0.2976 AML other m 2023-12-20T05:44:37.42
IV.SMA1.EHN. ML:1.6 0.00048074525 0.16 AML other m 2023-12-20T05:44:37.35
IV.LNSS.HHN. ML:1.4 0.0002367083 0.1408 AML other m 2023-12-20T05:44:39.81
IV.RM33.EHE. ML:1.5 0.0002528059 0.1408 AML other m 2023-12-20T05:44:38.96
IV.LNSS.HHE. ML:1.6 0.000378 0.14 AML other m 2023-12-20T05:44:38.23
IV.RM33.EHN. ML:1.6 0.0003265 0.1 AML other m 2023-12-20T05:44:38.39
IV.RM33.HNN. ML:1.6 0.0003085 0.1 AML other m 2023-12-20T05:44:38.34
IV.MTRA.EHN. ML:1.8 0.00042449999999999996 0.14 AML other m 2023-12-20T05:44:38.77
IV.RM33.HNE. ML:1.5 0.0002641037 0.2016 AML other m 2023-12-20T05:44:38.80
IV.MTRA.EHE. ML:1.6 0.0002682666 0.1184 AML other m 2023-12-20T05:44:38.95
IV.NRCA.HHN. ML:1.7 0.000336 0.12 AML other m 2023-12-20T05:44:39.54
IV.NRCA.HHE. ML:1.7 0.00035201935000000003 0.1792 AML other m 2023-12-20T05:44:39.64
IV.GAVE.EHN. ML:1.5 0.00017889519999999997 0.1184 AML other m 2023-12-20T05:44:41.87
IV.TERO.HHN. ML:1.6 0.00016534090000000002 0.0832 AML other m 2023-12-20T05:44:42.22
IV.TERO.HHE. ML:1.3 0.000078748915 0.0608 AML other m 2023-12-20T05:44:42.64
IV.GAVE.EHE. ML:1.5 0.00015336995000000001 0.1824 AML other m 2023-12-20T05:44:43.01
IV.FIAM.HHE. ML:1.2 0.000054648910000000005 0.1792 AML other m 2023-12-20T05:44:46.22
IV.FIAM.HHN. ML:1.2 0.0000496 0.92 AML other m 2023-12-20T05:44:46.73
IV.GUMA.HHE. ML:1.7 0.00012760705 0.4192 AML other m 2023-12-20T05:44:47.79
IV.GUMA.HHN. ML:1.5 0.00009429999999999999 1.38 AML other m 2023-12-20T05:44:50.91
IV.MOMA.HHN. ML:1.3 0.00004455 1.4 AML other m 2023-12-20T05:44:50.08
IV.MOMA.HHE. ML:1.3 0.000047408965 0.1984 AML other m 2023-12-20T05:44:50.03
IV.MML1.EHE. ML:0.8 0.000016550000000000002 0.82 AML other m 2023-12-20T05:44:50.55
IV.MML1.EHN. ML:0.8 0.0000155 0.16 AML other m 2023-12-20T05:44:52.91
IV.LNSS.HNE. ML:1.6 0.000339329 0.1408 AML other m 2023-12-20T05:44:38.23
IV.LNSS.HNN. ML:1.4 0.00021487885000000002 0.1408 AML other m 2023-12-20T05:44:39.81
IV.MTRA.HNE. ML:1.6 0.0002734873 0.24 AML other m 2023-12-20T05:44:39.87
IV.MTRA.HNN. ML:1.7 0.00039159480000000005 0.1312 AML other m 2023-12-20T05:44:38.77
IV.NRCA.HNE. ML:1.7 0.00035171765 0.1728 AML other m 2023-12-20T05:44:39.64
IV.NRCA.HNN. ML:1.7 0.0003014413 0.1184 AML other m 2023-12-20T05:44:39.54
IV.GAVE.HNE. ML:1.4 0.000142818145 0.1504 AML other m 2023-12-20T05:44:41.68
IV.GAVE.HNN. ML:1.5 0.00018586160000000002 1.2288 AML other m 2023-12-20T05:44:39.93
IV.TERO.HNE. ML:1.2 0.000073882735 0.6304 AML other m 2023-12-20T05:44:50.55
IV.TERO.HNN. ML:1.6 0.0001783951 0.0704 AML other m 2023-12-20T05:44:42.27
IV.FIAM.HNE. ML:1.6 0.000116132655 0.7008 AML other m 2023-12-20T05:44:42.00
IV.FIAM.HNN. ML:1.8 0.00018166559999999998 0.8704 AML other m 2023-12-20T05:44:42.17
IV.CSP1.EHE. ML:1.3 0.00005147578 0.1792 AML other m 2023-12-20T05:44:48.68
IV.CSP1.EHN. ML:1.4 0.00006836384500000001 0.2592 AML other m 2023-12-20T05:44:48.31
IV.MF5.EHE. ML:1.2 0.00004807668499999999 0.4 AML other m 2023-12-20T05:44:46.61
IV.MF5.EHN. ML:1.2 0.00005193424 0.1408 AML other m 2023-12-20T05:44:48.39
IV.CESI.HNE. ML:1.6 0.000102202715 0.6688 AML other m 2023-12-20T05:44:51.14
IV.CESI.HNN. ML:1.7 0.00013033682499999998 0.7584 AML other m 2023-12-20T05:44:44.04
IV.CESI.HHE. ML:0.8 0.00001751165 0.1216 AML other m 2023-12-20T05:44:48.42
IV.CESI.HHN. ML:1.0 0.00002810625 0.2016 AML other m 2023-12-20T05:44:50.28
IV.GUMA.HNE. ML:1.6 0.00011836622500000001 0.6912 AML other m 2023-12-20T05:44:54.53
IV.GUMA.HNN. ML:1.7 0.0001541157 0.512 AML other m 2023-12-20T05:44:50.51
IV.OFFI.HHE. ML:1.3 0.000048665954999999995 0.32 AML other m 2023-12-20T05:44:53.28
IV.OFFI.HHN. ML:1.4 0.00006720066999999999 0.48 AML other m 2023-12-20T05:44:54.59
IV.MOMA.HNE. ML:1.8 0.00013299139500000002 0.7584 AML other m 2023-12-20T05:44:44.19
IV.MOMA.HNN. ML:1.8 0.00015466554999999998 1.1104 AML other m 2023-12-20T05:45:05.41
IV.MML1.HNE. ML:1.7 0.00012707935 0.7488 AML other m 2023-12-20T05:45:02.38
IV.MML1.HNN. ML:1.8 0.00014817170000000002 0.7808 AML other m 2023-12-20T05:45:01.88
IV.VCEL.EHE. ML:1.2 0.000035460289999999996 0.2784 AML other m 2023-12-20T05:44:51.80
IV.VCEL.EHN. ML:1.3 0.000046804755000000007 0.2208 AML other m 2023-12-20T05:44:51.91
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