Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 01-01-2023 and time 00:20:41 (UTC) in region 1 km NW Lariano (RM)

A magnitude ML 1.6 earthquake occured in region: 1 km NW Lariano (RM), on

  • 01-01-2023 00:20:41 (UTC)
  • 01-01-2023 01:20:41 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.7360, 12.8230 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
Lariano RM 1 13432 13432
Velletri RM 7 53303 66735
Labico RM 8 6379 73114
Artena RM 8 14276 87390
Rocca Priora RM 8 11962 99352
Nemi RM 9 1943 101295
Valmontone RM 9 15959 117254
San Cesareo RM 10 15153 132407
Rocca di Papa RM 10 17034 149441
Rocca Massima LT 10 1136 150577
Monte Compatri RM 11 11978 162555
Genzano di Roma RM 11 23970 186525
Zagarolo RM 12 17843 204368
Lanuvio RM 12 13632 218000
Colonna RM 13 4287 222287
Monte Porzio Catone RM 13 8693 230980
Ariccia RM 13 19407 250387
Cori LT 13 11065 261452
Palestrina RM 13 21672 283124
Cave RM 13 11287 294411
Albano Laziale RM 14 41715 336126
Castel San Pietro Romano RM 14 902 337028
Frascati RM 14 22087 359115
Grottaferrata RM 14 20327 379442
Marino RM 14 43026 422468
Castel Gandolfo RM 14 8997 431465
Gallicano nel Lazio RM 15 6334 437799
Colleferro RM 15 21595 459394
Cisterna di Latina LT 16 36868 496262
Rocca di Cave RM 16 377 496639
Genazzano RM 16 6036 502675
Segni RM 17 9159 511834
Capranica Prenestina RM 18 351 512185
Poli RM 18 2418 514603
Gavignano RM 20 1916 516519
Ciampino RM 20 38412 554931
Casape RM 20 744 555675

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km NE of Velletri (53303 inhabitants)
21 Km NE of Aprilia (73446 inhabitants)
25 Km S of Tivoli (56533 inhabitants)
28 Km E of Pomezia (62966 inhabitants)
31 Km S of Guidonia Montecelio (88673 inhabitants)
31 Km N of Latina (125985 inhabitants)
33 Km SE of Roma (2864731 inhabitants)
36 Km NE of Anzio (54211 inhabitants)
49 Km E of Fiumicino (78395 inhabitants)
83 Km SW of L'Aquila (69753 inhabitants)
93 Km S of Terni (111501 inhabitants)
94 Km E of Civitavecchia (52991 inhabitants)
96 Km SE 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
Bulletin
Rev1000 		ML 1.6 2023-01-01
00:20:41		 41.7365 12.8228 8 2024-03-01
17:18:12		 Bollettino Sismico Italiano INGV 118930071
Reviewed
Rev100 		ML 1.4 2023-01-01
00:20:41		 41.7342 12.8153 8 2023-01-01
00:43:06		 Sala Sismica INGV-Roma 113221461
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-01-01 00:20:41 ± 0.06
Latitude 41.7365 ± 0.0045
Longitude 12.8228 ± 0.0060
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 118930071

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 502
Semi-minor axis of confidence ellipse (meter) 468
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 253
Circular confidence region, given by single value of horizontal uncertainty (meter) 500.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.86245
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 21
Type of magnitude ML
Reference to an origin 118930071
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-07-03 09:54:57

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 11
Type of magnitude ML
Reference to an origin 113221461
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-01-01 00:43:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IX.SCL3.EHZ.02 2023-01-01T00:21:47.32 3.0 undecidable manual Sn -0.89 0
IV.TRE1.HNZ. 2023-01-01T00:21:34.78 3.0 undecidable manual Sg 3.89 0
GU.CARD.HHZ. 2023-01-01T00:21:29.77 3.0 undecidable manual Pg 4.53 0
IV.VVLD.HHZ. 2023-01-01T00:21:03.39 0.6 undecidable manual S 77 67.7766 50 0.46 42
IV.LRP.EHZ. 2023-01-01T00:21:02.79 0.6 undecidable manual S 99 63.9915 50 0.87 36
IV.PTQR.HHZ. 2023-01-01T00:21:00.81 0.6 undecidable manual S 56 57.2982 50 0.69 39
IV.T0110.HHZ. 2023-01-01T00:20:58.10 0.6 undecidable manual P 55 95.7264 50 -0.12 43
IV.INTR.HHZ. 2023-01-01T00:20:57.63 0.3 undecidable manual P 71 94.4388 50 -0.38 61
IV.TOLF.HHN. 2023-01-01T00:20:55.20 0.1 undecidable manual P 298 77.0673 50 -0.13 88
IV.GIUL.HHZ. 2023-01-01T00:20:55.90 0.3 undecidable manual S 119 40.9257 50 0.16 70
IV.POFI.HNE. 2023-01-01T00:20:54.54 0.3 undecidable manual P 91 73.6707 50 -0.27 65
IV.LRP.EHZ. 2023-01-01T00:20:53.08 0.3 undecidable manual P 99 63.9915 50 -0.25 66
IV.VVLD.HHZ. 2023-01-01T00:20:53.65 0.3 undecidable manual P 77 67.7766 50 -0.26 66
IV.FIAM.HHZ. 2023-01-01T00:20:52.96 0.3 undecidable manual P 22 63.7917 50 -0.33 65
IV.PTQR.HHZ. 2023-01-01T00:20:52.16 0.3 undecidable manual P 56 57.2982 50 -0.12 69
IV.SRES.HHN. 2023-01-01T00:20:52.91 0.3 undecidable manual P 335 61.1943 50 0.01 70
IV.ROM9.HNE. 2023-01-01T00:20:51.66 0.6 undecidable manual S 292 27.3504 105 0.21 47
IV.CERT.HHZ. 2023-01-01T00:20:51.50 0.6 undecidable manual S 29 26.9508 106 0.19 48
IV.LATB.EHZ. 2023-01-01T00:20:51.96 0.6 undecidable manual S 157 29.2485 104 -0.12 48
IV.GUAR.HHZ. 2023-01-01T00:20:49.57 0.3 undecidable manual P 81 41.0256 50 -0.21 70
IV.GIUL.HHZ. 2023-01-01T00:20:49.55 0.1 undecidable manual P 119 40.9257 50 -0.21 93
IV.MTCE.HHE. 2023-01-01T00:20:48.16 0.3 undecidable manual P 348 32.4453 103 -0.1 72
IV.LATB.EHZ. 2023-01-01T00:20:47.62 0.3 undecidable manual P 157 29.2485 104 -0.03 74
IV.ROM9.HNE. 2023-01-01T00:20:47.84 0.3 undecidable manual P 292 27.3504 105 0.56 65
IV.CERT.HHZ. 2023-01-01T00:20:47.25 0.3 undecidable manual P 29 26.9508 106 0.05 74
IV.LAV9.HHZ. 2023-01-01T00:20:46.71 0.6 undecidable manual S 238 12.1767 122 0.16 49
IV.MA9.HHZ. 2023-01-01T00:20:46.44 0.6 undecidable manual S 285 14.0748 118 -0.68 43
IV.RMP.HHZ. 2023-01-01T00:20:46.67 0.3 undecidable manual S 311 12.876 120 -0.09 75
IV.RDP.HHZ. 2023-01-01T00:20:45.66 0.3 undecidable manual S 286 9.6792 128 -0.19 74
IV.MA9.HHZ. 2023-01-01T00:20:44.75 0.3 undecidable manual P 285 14.0748 118 -0.03 76
IV.VIVA.HHZ. 2023-01-01T00:20:44.41 0.3 undecidable manual S 289 4.5954 148 -0.25 74
IV.RMP.HHZ. 2023-01-01T00:20:44.84 0.1 undecidable manual P 311 12.876 120 0.27 96
IV.LAV9.HHZ. 2023-01-01T00:20:44.83 0.3 undecidable manual P 238 12.1767 122 0.38 71
IV.RDP.HHZ. 2023-01-01T00:20:44.21 0.1 undecidable manual P 286 9.6792 128 0.16 99
IV.VIVA.HHZ. 2023-01-01T00:20:43.51 0.1 undecidable manual P 289 4.5954 148 0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RDP.HHN. ML:2.2 0.0022710499999999997 0.2 AML other m 2023-01-01T00:20:46.26
IV.LAV9.HHN. ML:1.8 0.0008787833999999999 0.22 AML other m 2023-01-01T00:20:47.54
IV.LAV9.HNN. ML:2.2 0.0020867595 0.23 AML other m 2023-01-01T00:20:47.54
IV.RMP.HHN. ML:2.3 0.0026214235 0.1 AML other m 2023-01-01T00:20:48.42
IV.RDP.HHE. ML:2.1 0.0019234830000000001 0.26 AML other m 2023-01-01T00:20:48.71
IV.LAV9.HHE. ML:1.9 0.00098112495 0.3 AML other m 2023-01-01T00:20:49.95
IV.LAV9.HNE. ML:2.2 0.0022840015 0.28 AML other m 2023-01-01T00:20:49.95
IV.RMP.HHE. ML:2.4 0.0028400920000000002 0.2 AML other m 2023-01-01T00:20:50.08
IV.CERT.HHN. ML:1.4 0.00013847005 0.18 AML other m 2023-01-01T00:20:52.95
IV.LATB.EHN. ML:0.3 0.000008696188 0.18 AML other m 2023-01-01T00:20:53.39
IV.CERT.HHE. ML:1.0 0.000058907959999999996 0.24 AML other m 2023-01-01T00:20:53.53
IV.LATB.EHE. ML:0.5 0.000016302965 0.24 AML other m 2023-01-01T00:20:53.80
IV.GIUL.HHE. ML:1.3 0.000071470795 1.54 AML other m 2023-01-01T00:20:55.20
IV.GIUL.HHN. ML:1.6 0.00014252455 0.32 AML other m 2023-01-01T00:20:56.47
IV.GUAR.HHE. ML:1.3 0.00007131841499999999 0.12 AML other m 2023-01-01T00:20:58.46
IV.GUAR.HHN. ML:1.4 0.00007883408999999999 0.2 AML other m 2023-01-01T00:20:58.78
IV.PTQR.HHN. ML:1.4 0.0000613 1.64 AML other m 2023-01-01T00:21:01.12
IV.FIAM.HNE. ML:1.9 0.00014611530000000001 1.22 AML other m 2023-01-01T00:21:01.05
IV.PTQR.HHE. ML:1.5 0.00007515 0.26 AML other m 2023-01-01T00:21:01.89
IV.LRP.EHE. ML:1.8 0.00011198535 0.26 AML other m 2023-01-01T00:21:03.45
IV.LRP.EHN. ML:1.0 0.000019877665 0.2 AML other m 2023-01-01T00:21:03.46
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