Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 20-12-2023 and time 21:09:52 (UTC) in region 4 km W Castel Sant'Angelo (RI)

A magnitude ML 1.5 earthquake occured in region: 4 km W Castel Sant'Angelo (RI), on

  • 20-12-2023 21:09:52 (UTC)
  • 20-12-2023 22:09:52 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.4080, 12.9900 at 9 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
Castel Sant'Angelo RI 4 1308 1308
Cittaducale RI 4 6828 8136
Borgo Velino RI 6 972 9108
Micigliano RI 7 127 9235
Antrodoco RI 8 2588 11823
Concerviano RI 9 291 12114
Cantalice RI 10 2755 14869
Rieti RI 10 47698 62567
Belmonte in Sabina RI 13 636 63203
Poggio Bustone RI 14 2055 65258
Petrella Salto RI 14 1197 66455
Longone Sabino RI 15 597 67052
Rocca Sinibalda RI 16 815 67867
Posta RI 16 694 68561
Rivodutri RI 16 1253 69814
Borbona RI 17 617 70431
Leonessa RI 17 2435 72866
Contigliano RI 18 3783 76649
Morro Reatino RI 18 373 77022
Varco Sabino RI 19 187 77209
Greccio RI 19 1558 78767
Torricella in Sabina RI 19 1342 80109
Monte San Giovanni in Sabina RI 19 714 80823
Fiamignano RI 19 1413 82236

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SE of Terni (111501 inhabitants)
34 Km W of L'Aquila (69753 inhabitants)
50 Km NE of Guidonia Montecelio (88673 inhabitants)
52 Km NE of Tivoli (56533 inhabitants)
65 Km W of Teramo (54892 inhabitants)
65 Km SE of Foligno (57155 inhabitants)
71 Km NE of Roma (2864731 inhabitants)
73 Km E of Viterbo (67173 inhabitants)
82 Km N of Velletri (53303 inhabitants)
91 Km NE of Pomezia (62966 inhabitants)
92 Km SE of Perugia (166134 inhabitants)
94 Km NE of Fiumicino (78395 inhabitants)
95 Km NE of Aprilia (73446 inhabitants)
96 Km W of Montesilvano (53738 inhabitants)
97 Km W of Chieti (51815 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
21:09:52		 42.4077 12.9895 9 2023-12-20
21:17:40		 Sala Sismica INGV-Roma 124166681
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-20 21:09:52 ± 0.05
Latitude 42.4077 ± 0.0027
Longitude 12.9895 ± 0.0049
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 124166681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 360
Semi-minor axis of confidence ellipse (meter) 260
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 89
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.70147
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 124166681
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-20 21:17:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAFE.HNZ. 2023-12-20T21:11:02.50 3.0 undecidable manual Sg 1.23 0
OX.MARN.HHZ. 2023-12-20T21:10:55.87 3.0 undecidable manual Pg 8.55 0
IV.CAFE.HNZ. 2023-12-20T21:10:32.28 3.0 undecidable manual Pg 0.92 0
IV.ASSB.HHZ. 2023-12-20T21:10:06.36 0.3 negative manual P 339 75.369 50 0.38 63
IV.CSP1.EHZ. 2023-12-20T21:10:06.37 0.6 undecidable manual P 13 77.8665 50 0.01 45
IV.SMA1.EHZ. 2023-12-20T21:10:05.76 0.6 undecidable manual S 49 37.5291 50 0.17 47
IV.FDMO.HHZ. 2023-12-20T21:10:05.05 1.0 positive manual P 6 70.1742 50 -0.13 22
IV.GAVE.HNZ. 2023-12-20T21:10:04.01 0.6 undecidable manual S 346 32.5452 50 -0.23 47
IV.MMO1.EHZ. 2023-12-20T21:10:03.91 1.0 positive manual P 27 61.0944 50 0.14 23
IV.CERT.HHE. 2023-12-20T21:10:02.08 1.0 undecidable manual P 181 50.9157 50 -0.12 23
IV.LNSS.HHZ. 2023-12-20T21:10:01.02 0.6 undecidable manual S 11 22.0668 113 0.02 50
IV.NRCA.HHZ. 2023-12-20T21:10:01.69 0.3 negative manual P 12 48.3183 50 -0.12 70
IV.CESX.HHZ. 2023-12-20T21:10:00.56 0.6 undecidable manual P 304 39.7269 50 0.08 48
IV.RM33.EHZ. 2023-12-20T21:10:00.88 0.6 undecidable manual S 59 21.5673 113 0.03 50
IV.SMA1.EHZ. 2023-12-20T21:10:00.19 0.6 positive manual P 49 37.5291 50 0.05 48
IV.CAMP.HHZ. 2023-12-20T21:10:00.00 1.0 undecidable manual P 67 37.1295 50 -0.08 24
IV.FIAM.HHZ. 2023-12-20T21:09:59.87 0.6 undecidable manual S 146 18.6702 116 -0.08 50
IV.GAVE.HNZ. 2023-12-20T21:09:59.20 0.1 undecidable manual P 346 32.5452 50 -0.16 95
IV.ARRO.EHZ. 2023-12-20T21:09:58.40 0.6 negative manual P 316 26.3514 109 0.09 49
IV.RM33.EHZ. 2023-12-20T21:09:57.29 1.0 undecidable manual P 59 21.5673 113 -0.12 24
IV.LNSS.HHZ. 2023-12-20T21:09:57.43 0.3 undecidable manual P 11 22.0668 113 -0.07 74
IV.FIAM.HHZ. 2023-12-20T21:09:56.92 0.1 positive manual P 146 18.6702 116 0.04 100
IV.MTCE.HHN. 2023-12-20T21:09:52.08 0.6 undecidable manual P 47.3193 -9.56 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.HNN. ML:1.7 0.000336 0.44 AML other m 2023-12-20T21:10:01.46
IV.RM33.EHN. ML:1.7 0.0003235 0.44 AML other m 2023-12-20T21:10:01.46
IV.RM33.HNE. ML:1.6 0.00024349999999999998 0.82 AML other m 2023-12-20T21:10:01.92
IV.RM33.EHE. ML:1.4 0.000192 1.52 AML other m 2023-12-20T21:10:01.92
IV.FIAM.HHE. ML:1.3 0.00016999999999999999 0.36 AML other m 2023-12-20T21:10:02.62
IV.LNSS.HHE. ML:1.5 0.00021150000000000002 0.32 AML other m 2023-12-20T21:10:03.09
IV.ARRO.EHE. ML:1.1 0.0000633 0.68 AML other m 2023-12-20T21:10:03.15
IV.FIAM.HHN. ML:1.4 0.00019800000000000002 0.4 AML other m 2023-12-20T21:10:04.35
IV.LNSS.HHN. ML:1.6 0.00023899999999999998 0.54 AML other m 2023-12-20T21:10:04.32
IV.ARRO.EHN. ML:1.1 0.00006795000000000001 0.34 AML other m 2023-12-20T21:10:05.31
IV.SMA1.EHN. ML:1.5 0.00011499999999999999 0.54 AML other m 2023-12-20T21:10:06.00
IV.SMA1.EHE. ML:1.5 0.00011415 0.76 AML other m 2023-12-20T21:10:07.03
IV.NRCA.HHE. ML:1.3 0.00005205 0.46 AML other m 2023-12-20T21:10:09.32
IV.NRCA.HHN. ML:1.1 0.0000346 1.22 AML other m 2023-12-20T21:10:11.29
IV.ARVD.HHE. ML:1.6 0.00003225 0.66 AML other m 2023-12-20T21:10:28.30
IV.ARVD.HHN. ML:1.4 0.0000205 0.56 AML other m 2023-12-20T21:10:37.69
IV.CAFE.HNN. ML:3.3 0.00041050000000000006 0.74 AML other m 2023-12-20T21:11:13.79
IV.CAFE.HNE. ML:3.3 0.0004345 0.68 AML other m 2023-12-20T21:11:13.79
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