Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 06-08-2023 and time 01:28:50 (Italy) in region 7 km NW Colonna (RM)

A magnitude ML 1.4 earthquake occured in region: 7 km NW Colonna (RM), on

  • 05-08-2023 23:28:50 (UTC)
  • 06-08-2023 01:28:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.8830, 12.6970 at 11 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
Colonna RM 7 4287 4287
Monte Porzio Catone RM 8 8693 12980
Frascati RM 9 22087 35067
Monte Compatri RM 9 11978 47045
Gallicano nel Lazio RM 11 6334 53379
Grottaferrata RM 11 20327 73706
San Cesareo RM 11 15153 88859
Rocca Priora RM 11 11962 100821
Ciampino RM 12 38412 139233
Zagarolo RM 12 17843 157076
Tivoli RM 12 56533 213609
Marino RM 13 43026 256635
Guidonia Montecelio RM 13 88673 345308
Rocca di Papa RM 13 17034 362342
Fonte Nuova RM 14 32562 394904
San Gregorio da Sassola RM 15 1619 396523
Castel Gandolfo RM 16 8997 405520
Casape RM 16 744 406264
Poli RM 16 2418 408682
Palestrina RM 17 21672 430354
Castel San Pietro Romano RM 17 902 431256
Sant'Angelo Romano RM 17 5018 436274
Albano Laziale RM 17 41715 477989
Mentana RM 18 22921 500910
Roma RM 18 2864731 3365641
Castel Madama RM 18 7399 3373040
Nemi RM 18 1943 3374983
Ariccia RM 18 19407 3394390
Marcellina RM 18 7280 3401670
San Polo dei Cavalieri RM 19 2992 3404662
Labico RM 19 6379 3411041
Genzano di Roma RM 20 23970 3435011
Monterotondo RM 20 40830 3475841

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km SW of Tivoli (56533 inhabitants)
13 Km S of Guidonia Montecelio (88673 inhabitants)
18 Km E of Roma (2864731 inhabitants)
23 Km NW of Velletri (53303 inhabitants)
29 Km NE of Pomezia (62966 inhabitants)
32 Km N of Aprilia (73446 inhabitants)
40 Km E of Fiumicino (78395 inhabitants)
49 Km N of Anzio (54211 inhabitants)
49 Km NW of Latina (125985 inhabitants)
76 Km S of Terni (111501 inhabitants)
77 Km SE of Viterbo (67173 inhabitants)
78 Km SW of L'Aquila (69753 inhabitants)
78 Km E of Civitavecchia (52991 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 1.4 2023-08-05
23:28:50		 41.8832 12.6968 11 2024-09-10
16:44:30		 Bollettino Sismico Italiano INGV 131014371
Reviewed
Rev100 		Md 2.1
ML 1.3 		2023-08-05
23:28:51		 41.8928 12.7102 11 2023-08-05
23:36:10		 Sala Sismica INGV-Roma 119892961
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-08-05 23:28:50 ± 0.1
Latitude 41.8832 ± 0.0045
Longitude 12.6968 ± 0.0097
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 131014371

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 721
Semi-minor axis of confidence ellipse (meter) 517
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 274
Circular confidence region, given by single value of horizontal uncertainty (meter) 720.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.11691
Epicentral distance of station farthest from the epicenter (degree) 0.54139
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 131014371
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-08-27 12:48:09

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 119892961
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-05 23:36:10

Md:2.1

Field Value
Value 2.1
Uncertainty 0.0
Num. used stations 1
Type of magnitude Md
Reference to an origin 119892961
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-05 23:36:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIUL.HHZ. 2023-08-05T23:29:09.79 0.6 undecidable manual S 128 58.5969 50 0.67 41
IV.PTQR.HHZ. 2023-08-05T23:29:09.99 0.6 undecidable manual S 75 60.0954 50 0.48 42
IV.LATB.EHZ. 2023-08-05T23:29:06.09 0.6 undecidable manual S 153 48.4182 50 -0.32 43
IV.PTQR.HHZ. 2023-08-05T23:29:01.60 0.3 undecidable manual P 75 60.0954 50 -0.09 68
IV.GIUL.HHZ. 2023-08-05T23:29:01.20 0.3 undecidable manual P 128 58.5969 50 -0.25 65
IV.FIAM.HHZ. 2023-08-05T23:29:00.83 0.3 undecidable manual P 39 55.0005 50 -0.07 69
IV.CERT.HHZ. 2023-08-05T23:28:59.89 0.6 undecidable manual S 73 24.6531 50 -0.17 48
IV.LATB.EHZ. 2023-08-05T23:28:59.64 0.3 undecidable manual P 153 48.4182 50 -0.26 66
IV.VIVA.HHN. 2023-08-05T23:28:58.12 0.6 undecidable manual S 158 15.9729 124 0.42 46
IV.RCAV.EHZ. 2023-08-05T23:28:58.66 0.6 undecidable manual S 101 20.868 50 -0.41 46
IV.MTCE.HHZ. 2023-08-05T23:28:57.72 0.6 undecidable manual S 14 15.9729 124 0.01 49
IV.RDP.HNN. 2023-08-05T23:28:57.51 0.6 undecidable manual S 175 13.6752 129 0.44 46
IT.RMMM.HGE. 2023-08-05T23:28:56.01 0.3 undecidable manual P 283 20.6682 50 0.4 71
IV.SAMA.EHN. 2023-08-05T23:28:56.64 0.6 undecidable manual S 217 14.2746 127 -0.6 43
IV.CERT.HHZ. 2023-08-05T23:28:56.17 0.1 undecidable manual P 73 24.6531 50 -0.05 97
IV.MA9.HHN. 2023-08-05T23:28:56.17 0.6 undecidable manual S 194 12.9759 130 -0.7 41
IV.VIVA.HHN. 2023-08-05T23:28:55.32 0.3 undecidable manual P 158 15.9729 124 0.46 69
IV.RCAV.EHZ. 2023-08-05T23:28:55.54 0.1 undecidable manual P 101 20.868 50 -0.11 97
IV.SAMA.EHN. 2023-08-05T23:28:54.42 0.1 undecidable manual P 217 14.2746 127 -0.17 96
IV.RDP.HNN. 2023-08-05T23:28:54.77 0.3 undecidable manual P 175 13.6752 129 0.28 72
IV.MA9.HHN. 2023-08-05T23:28:54.57 0.3 undecidable manual P 194 12.9759 130 0.18 74
IV.MTCE.HHZ. 2023-08-05T23:28:54.88 0.1 undecidable manual P 14 15.9729 124 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTCE.HHE. ML:1.4 0.00024249999999999999 0.4 AML other m 2023-08-05T23:28:59.80
IV.RCAV.EHN. ML:1.5 0.000227 0.24 AML other m 2023-08-05T23:28:59.60
IV.RCAV.EHE. ML:1.5 0.0002175 0.46 AML other m 2023-08-05T23:29:01.43
IV.MTCE.HHN. ML:1.3 0.000174 0.64 AML other m 2023-08-05T23:29:01.14
IV.CERT.HHN. ML:1.5 0.0001855 0.92 AML other m 2023-08-05T23:29:01.76
IV.CERT.HHE. ML:1.1 0.00006975 0.44 AML other m 2023-08-05T23:29:01.55
IV.FIAM.HHE. ML:1.3 0.00004985 0.96 AML other m 2023-08-05T23:29:10.71
IV.FIAM.HHN. ML:1.3 0.00004435 0.42 AML other m 2023-08-05T23:29:11.71
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