Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 20-04-2023 and time 21:02:05 (Italy) in region 5 km NW Palombara Sabina (RM)

A magnitude ML 1.6 earthquake occured in region: 5 km NW Palombara Sabina (RM), on

  • 20-04-2023 19:02:05 (UTC)
  • 20-04-2023 21:02:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.0930, 12.7160 at 8 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Palombara Sabina RM 5 13269 13269
Montelibretti RM 5 5323 18592
Moricone RM 6 2650 21242
Sant'Angelo Romano RM 7 5018 26260
Montorio Romano RM 9 1984 28244
Mentana RM 9 22921 51165
Monterotondo RM 9 40830 91995
Nerola RM 10 1926 93921
Monteflavio RM 10 1348 95269
Guidonia Montecelio RM 10 88673 183942
Marcellina RM 11 7280 191222
Fara in Sabina RI 13 13742 204964
Scandriglia RI 13 3108 208072
Fonte Nuova RM 13 32562 240634
Fiano Romano RM 14 15360 255994
San Polo dei Cavalieri RM 14 2992 258986
Toffia RI 14 1058 260044
Poggio Nativo RI 15 2622 262666
Capena RM 16 10592 273258
Licenza RM 16 1011 274269
Castelnuovo di Farfa RI 16 1059 275328
Roccagiovine RM 16 263 275591
Tivoli RM 16 56533 332124
Riano RM 16 10466 342590
Civitella San Paolo RM 16 2066 344656
Percile RM 16 255 344911
Vicovaro RM 17 4019 348930
Frasso Sabino RI 17 743 349673
Montopoli di Sabina RI 17 4210 353883
Mompeo RI 18 530 354413
Nazzano RM 18 1436 355849
Torrita Tiberina RM 18 1089 356938
Castelnuovo di Porto RM 18 8630 365568
Poggio Moiano RI 18 2751 368319
Castel Madama RM 18 7399 375718
Morlupo RM 18 8696 384414
Mandela RM 18 917 385331
Salisano RI 19 567 385898
Orvinio RI 19 405 386303
Casaprota RI 19 744 387047
Poggio Mirteto RI 19 6315 393362
Monteleone Sabino RI 20 1224 394586

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km N of Guidonia Montecelio (88673 inhabitants)
16 Km NW of Tivoli (56533 inhabitants)
29 Km NE of Roma (2864731 inhabitants)
45 Km N of Velletri (53303 inhabitants)
50 Km NE of Pomezia (62966 inhabitants)
52 Km S of Terni (111501 inhabitants)
53 Km NE of Fiumicino (78395 inhabitants)
56 Km N of Aprilia (73446 inhabitants)
62 Km SE of Viterbo (67173 inhabitants)
63 Km W of L'Aquila (69753 inhabitants)
71 Km N of Latina (125985 inhabitants)
72 Km N of Anzio (54211 inhabitants)
76 Km E of Civitavecchia (52991 inhabitants)
96 Km S of Foligno (57155 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
Bulletin
Rev1000 		ML 1.6 2023-04-20
19:02:05		 42.0932 12.7165 8 2024-03-01
17:18:08		 Bollettino Sismico Italiano INGV 117290571
Reviewed
Rev100 		ML 1.5 2023-04-20
19:02:04		 42.0757 12.6922 9 2023-04-20
19:09:29		 Sala Sismica INGV-Roma 116557861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-20 19:02:05 ± 0.05
Latitude 42.0932 ± 0.0027
Longitude 12.7165 ± 0.0048
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 117290571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 377
Semi-minor axis of confidence ellipse (meter) 213
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 79
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
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 38
Number of defining phases 38
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.07285
Epicentral distance of station farthest from the epicenter (degree) 1.06120
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 116557861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-20 19:09:29

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 117290571
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-01-26 14:15:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2023-04-20T19:02:25.23 0.6 undecidable manual P 20 117.7932 50 0.03 41
IV.RM33.EHZ. 2023-04-20T19:02:25.03 0.6 undecidable manual S 41 61.5939 50 0.16 44
IV.LNSS.HNZ. 2023-04-20T19:02:25.46 0.6 undecidable manual S 25 62.493 50 0.37 42
IV.TOLF.HHN. 2023-04-20T19:02:24.37 0.6 undecidable manual S 267 59.0964 50 0.18 44
IV.GUAR.HNN. 2023-04-20T19:02:24.60 0.6 undecidable manual S 124 59.2962 50 0.36 42
IV.BARO.HNZ. 2023-04-20T19:02:23.99 0.6 undecidable manual S 288 57.2982 50 0.27 43
IV.ARRO.EHZ. 2023-04-20T19:02:23.17 0.6 undecidable manual S 4 54.1014 50 0.32 43
IV.FDMO.HHZ. 2023-04-20T19:02:23.59 0.3 undecidable manual P 16 108.9132 50 -0.25 59
IV.CESI.HHZ. 2023-04-20T19:02:22.71 0.3 undecidable manual P 9 102.3198 50 -0.11 62
IV.MMO1.EHZ. 2023-04-20T19:02:22.40 0.6 undecidable manual P 29 102.4197 50 -0.44 38
7F.SIB1.EHE. 2023-04-20T19:02:21.96 0.3 undecidable manual P 27 99.8223 50 -0.47 58
IV.NRCA.HHZ. 2023-04-20T19:02:20.55 0.6 undecidable manual P 21 88.3449 50 -0.12 42
IV.SMA1.EHZ. 2023-04-20T19:02:19.11 0.6 undecidable manual P 40 78.2661 50 0 44
IV.MOMA.HHZ. 2023-04-20T19:02:19.20 0.3 undecidable manual P 351 79.7646 50 -0.14 64
IV.SAMA.EHZ. 2023-04-20T19:02:18.43 0.6 undecidable manual S 197 36.1416 102 0.43 44
IV.GAVE.EHN. 2023-04-20T19:02:17.64 0.3 undecidable manual P 12 68.0763 50 0.1 66
IV.RM33.EHZ. 2023-04-20T19:02:16.16 0.3 undecidable manual P 41 61.5939 50 -0.39 63
IV.CESX.HHE. 2023-04-20T19:02:16.32 0.3 undecidable manual P 350 58.1973 50 0.31 65
IV.LNSS.HNZ. 2023-04-20T19:02:16.33 0.1 undecidable manual P 25 62.493 50 -0.35 85
IV.RMP.HHN. 2023-04-20T19:02:16.54 0.6 undecidable manual S 182 31.2465 104 0.22 46
IT.CSO1.HGZ. 2023-04-20T19:02:16.39 0.6 undecidable manual S 88 30.5472 104 0.28 46
IV.RCAV.EHZ. 2023-04-20T19:02:16.64 0.6 undecidable manual S 145 33.1446 103 -0.34 45
IV.TOLF.HHN. 2023-04-20T19:02:16.12 0.3 undecidable manual P 267 59.0964 50 -0.04 68
IV.GUAR.HNN. 2023-04-20T19:02:16.71 0.3 undecidable manual P 124 59.2962 50 0.52 61
IV.ARRO.EHZ. 2023-04-20T19:02:15.09 0.3 undecidable manual P 4 54.1014 50 -0.29 65
IV.CERT.HHZ. 2023-04-20T19:02:15.10 0.6 undecidable manual S 126 27.0507 106 0.17 47
IV.BARO.HNZ. 2023-04-20T19:02:15.62 0.3 undecidable manual P 288 57.2982 50 -0.27 65
IV.SRES.HHZ. 2023-04-20T19:02:13.58 0.3 undecidable manual S 313 23.2545 108 -0.1 72
IT.MMP1.HGE. 2023-04-20T19:02:12.25 0.3 undecidable manual S 9 17.4714 113 0.45 67
IV.SAMA.EHZ. 2023-04-20T19:02:12.75 0.3 undecidable manual P 197 36.1416 102 0.17 69
IV.RMP.HHN. 2023-04-20T19:02:11.64 0.3 undecidable manual P 182 31.2465 104 0.03 72
IT.CSO1.HGZ. 2023-04-20T19:02:11.52 0.3 undecidable manual P 88 30.5472 104 0.03 72
IV.RCAV.EHZ. 2023-04-20T19:02:11.46 0.3 undecidable manual P 145 33.1446 103 -0.53 64
IV.CERT.HHZ. 2023-04-20T19:02:10.77 0.3 undecidable manual P 126 27.0507 106 -0.04 72
IV.SRES.HHZ. 2023-04-20T19:02:10.02 0.3 undecidable manual P 313 23.2545 108 -0.06 72
IT.MMP1.HGE. 2023-04-20T19:02:09.33 0.3 undecidable manual P 9 17.4714 113 0.33 69
IV.MTCE.HHZ. 2023-04-20T19:02:08.54 0.6 undecidable manual S 165 8.0808 133 -0.48 45
IV.MTCE.HHZ. 2023-04-20T19:02:07.41 0.1 undecidable manual P 165 8.0808 133 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTCE.HHE. ML:2.0 0.0016200000000000001 0.44 AML other m 2023-04-20T19:02:09.60
IV.MTCE.HHN. ML:1.6 0.0007155 1.54 AML other m 2023-04-20T19:02:09.02
IV.CERT.HNN. ML:1.6 0.000246 0.54 AML other m 2023-04-20T19:02:16.49
IV.RCAV.EHN. ML:1.5 0.0001385 0.78 AML other m 2023-04-20T19:02:17.95
IV.CERT.HNE. ML:1.9 0.00041000000000000005 1.22 AML other m 2023-04-20T19:02:17.77
IV.CERT.HHE. ML:1.4 0.0001325 0.58 AML other m 2023-04-20T19:02:18.14
IV.CERT.HHN. ML:1.6 0.00021250000000000002 0.88 AML other m 2023-04-20T19:02:18.48
IV.RCAV.EHE. ML:1.6 0.0001945 0.42 AML other m 2023-04-20T19:02:18.73
IV.ARRO.EHN. ML:1.5 0.00007505000000000001 0.54 AML other m 2023-04-20T19:02:25.16
IV.RM33.EHN. ML:1.4 0.0000472 0.86 AML other m 2023-04-20T19:02:25.63
IV.FAGN.HHE. ML:2.0 0.000156 0.06 AML other m 2023-04-20T19:02:25.68
IV.ARRO.EHE. ML:1.3 0.000047350000000000006 0.84 AML other m 2023-04-20T19:02:27.19
IV.RM33.EHE. ML:1.4 0.000049500000000000004 0.92 AML other m 2023-04-20T19:02:33.13
IV.NRCA.HHE. ML:1.4 0.00003245 0.14 AML other m 2023-04-20T19:02:35.44
IV.SMA1.EHN. ML:1.4 0.00003955 1.56 AML other m 2023-04-20T19:02:36.02
IV.SMA1.EHE. ML:1.6 0.00005795 1.4 AML other m 2023-04-20T19:02:37.25
IV.NRCA.HHN. ML:1.4 0.0000286 1.86 AML other m 2023-04-20T19:02:38.96
IV.CESI.HHE. ML:1.6 0.000035199999999999995 0.9 AML other m 2023-04-20T19:02:41.49
IV.FDMO.HHE. ML:1.5 0.000024399999999999997 0.94 AML other m 2023-04-20T19:02:41.09
IV.CESI.HHN. ML:1.6 0.000042050000000000006 0.26 AML other m 2023-04-20T19:02:41.78
IV.FDMO.HHN. ML:1.4 0.0000192 1.56 AML other m 2023-04-20T19:02:41.95
IV.FAGN.HHN. ML:1.8 0.00009575 0.5 AML other m 2023-04-20T19:02:41.72
IV.VVLD.HHE. ML:1.6 0.00005585 0.08 AML other m 2023-04-20T19:02:43.17
IV.VVLD.HHN. ML:1.7 0.0000635 0.1 AML other m 2023-04-20T19:02:44.88
IV.MMO1.EHN. ML:1.5 0.000028285 0.48 AML other m 2023-04-20T19:02:48.44
IV.MMO1.EHE. ML:1.5 0.00002925 0.78 AML other m 2023-04-20T19:02:56.53
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