Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 20-06-2021 and time 00:56:51 (UTC) in region 6 km SW Ariccia (RM)

A magnitude ML 2.0 earthquake occured in region: 6 km SW Ariccia (RM), on

  • 20-06-2021 00:56:51 (UTC)
  • 20-06-2021 02:56:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.6810, 12.6290 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
Ariccia RM 6 19407 19407
Genzano di Roma RM 6 23970 43377
Albano Laziale RM 6 41715 85092
Lanuvio RM 6 13632 98724
Castel Gandolfo RM 8 8997 107721
Nemi RM 8 1943 109664
Aprilia LT 10 73446 183110
Marino RM 10 43026 226136
Pomezia RM 11 62966 289102
Ardea RM 11 49183 338285
Rocca di Papa RM 11 17034 355319
Velletri RM 12 53303 408622
Grottaferrata RM 13 20327 428949
Ciampino RM 14 38412 467361
Frascati RM 15 22087 489448
Monte Porzio Catone RM 17 8693 498141
Monte Compatri RM 17 11978 510119
Rocca Priora RM 17 11962 522081
Lariano RM 18 13432 535513
Cisterna di Latina LT 19 36868 572381
Colonna RM 20 4287 576668

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km N of Aprilia (73446 inhabitants)
11 Km E of Pomezia (62966 inhabitants)
12 Km W of Velletri (53303 inhabitants)
26 Km N of Anzio (54211 inhabitants)
27 Km SE of Roma (2864731 inhabitants)
33 Km NW of Latina (125985 inhabitants)
34 Km E of Fiumicino (78395 inhabitants)
35 Km SW of Tivoli (56533 inhabitants)
37 Km S of Guidonia Montecelio (88673 inhabitants)
83 Km SE of Civitavecchia (52991 inhabitants)
93 Km SE of Viterbo (67173 inhabitants)
98 Km S of Terni (111501 inhabitants)
98 Km SW of L'Aquila (69753 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 2.0 2021-06-20
00:56:51		 41.6813 12.6288 11 2021-12-29
11:12:17		 Bollettino Sismico Italiano INGV 93618131
Reviewed
Rev100 		ML 2.0 2021-06-20
00:56:51		 41.7073 12.6487 12 2021-06-20
01:10:53		 Sala Sismica INGV-Roma 91579781
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-06-20 00:56:51 ± 0.16
Latitude 41.6813 ± 0.0081
Longitude 12.6288 ± 0.0096
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 93618131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1029
Semi-minor axis of confidence ellipse (meter) 574
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 37
Circular confidence region, given by single value of horizontal uncertainty (meter) 1030.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 182
Number of associated phases, regardless of their use for origin computation 51
Number of defining phases 46
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.08368
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 28
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 93618131
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-08-03 13:41:33

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 91579781
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-06-20 01:10:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.GSCL.HHZ. 2021-06-20T00:58:21.56 3.0 undecidable manual Sg 5.18 0
IV.BRSN.EHZ. 2021-06-20T00:57:38.86 3.0 undecidable manual Pg 5.63 0
IV.GAVE.EHZ. 2021-06-20T00:57:25.95 0.3 undecidable manual S 11 114.1968 50 1.22 41
IV.ARRO.EHZ. 2021-06-20T00:57:22.44 0.6 undecidable manual S 6 100.2219 50 1.45 25
IV.VVLD.HHZ. 2021-06-20T00:57:17.24 0.3 undecidable manual S 75 84.8484 50 0.35 61
IV.LRP.EHZ. 2021-06-20T00:57:16.06 0.3 undecidable manual S 92 79.4649 50 0.61 57
IV.CFMN.HHZ. 2021-06-20T00:57:16.15 3.0 undecidable manual P 0.21 0
IV.FIAM.HNN. 2021-06-20T00:57:15.54 0.6 undecidable manual S 32 76.5678 50 0.87 34
IV.PTQR.HHZ. 2021-06-20T00:57:14.34 0.3 undecidable manual S 59 74.1702 50 0.32 63
IV.SMA1.EHZ. 2021-06-20T00:57:13.05 0.6 undecidable manual P 29 120.2907 50 1.37 25
IV.TOLF.HHZ. 2021-06-20T00:57:12.12 0.3 undecidable manual S 309 67.0773 50 -0.02 68
IV.GAVE.EHZ. 2021-06-20T00:57:11.11 0.6 undecidable manual P 11 114.1968 50 0.35 38
IV.SRES.HHZ. 2021-06-20T00:57:11.00 0.3 undecidable manual S 351 62.3931 50 0.1 67
IV.ARRO.EHZ. 2021-06-20T00:57:09.46 0.3 undecidable manual P 6 100.2219 50 0.86 50
IV.GUAR.HHZ. 2021-06-20T00:57:09.51 0.3 undecidable manual S 77 57.9975 50 -0.2 66
IV.MCI.EHZ. 2021-06-20T00:57:09.17 0.6 undecidable manual P 102 100.5216 50 0.53 38
IV.INTR.HHZ. 2021-06-20T00:57:09.89 0.6 undecidable manual P 70 111.5994 50 -0.46 38
IV.RM33.EHZ. 2021-06-20T00:57:09.87 0.3 undecidable manual P 28 103.7184 50 0.74 52
IV.GIUL.HHZ. 2021-06-20T00:57:08.39 0.3 undecidable manual S 105 53.7018 50 -0.17 67
IV.LRP.EHZ. 2021-06-20T00:57:05.04 0.1 undecidable manual P 92 79.4649 50 -0.36 82
IV.VVLD.HHZ. 2021-06-20T00:57:05.69 0.1 negative manual P 75 84.8484 50 -0.54 78
IV.BARO.EHZ. 2021-06-20T00:57:05.54 0.1 undecidable manual P 323 78.8655 50 0.23 84
IV.PTQR.HHZ. 2021-06-20T00:57:04.08 0.1 negative manual P 59 74.1702 50 -0.5 81
IV.FIAM.HNN. 2021-06-20T00:57:04.52 0.1 positive manual P 32 76.5678 50 -0.43 81
IV.CERT.HHZ. 2021-06-20T00:57:04.90 0.6 undecidable manual S 44 41.625 50 -0.45 43
IV.MTCE.HHZ. 2021-06-20T00:57:03.60 0.6 undecidable manual S 14 39.0276 50 -1.05 34
IV.LATB.EHZ. 2021-06-20T00:57:03.50 0.6 undecidable manual S 127 34.6431 50 0.02 48
IV.TOLF.HHZ. 2021-06-20T00:57:03.36 0.1 undecidable manual P 309 67.0773 50 -0.13 88
IT.MMP1.HGE. 2021-06-20T00:57:02.91 3.0 undecidable manual P 0.19 0
IT.CSO1.HGZ. 2021-06-20T00:57:02.33 0.3 undecidable manual P 39 59.9955 50 -0.07 68
IV.SRES.HHZ. 2021-06-20T00:57:02.36 0.3 undecidable manual P 351 62.3931 50 -0.41 63
IV.GUAR.HHZ. 2021-06-20T00:57:02.01 0.3 undecidable manual P 77 57.9975 50 -0.07 68
IV.GIUL.HHZ. 2021-06-20T00:57:01.04 0.1 undecidable manual P 105 53.7018 50 -0.38 86
IV.CERT.HHZ. 2021-06-20T00:56:59.04 0.1 negative manual P 44 41.625 50 -0.53 85
IT.RMMM.HGE. 2021-06-20T00:56:58.56 0.3 undecidable manual P 332 30.5472 50 0.7 60
IT.RMVT.HGE. 2021-06-20T00:56:58.33 3.0 undecidable manual P 0.23 0
IV.RMP.HHZ. 2021-06-20T00:56:58.00 0.6 undecidable manual S 23 15.7731 124 -0.26 47
IV.MTCE.HHZ. 2021-06-20T00:56:58.58 0.1 undecidable manual P 14 39.0276 50 -0.58 83
IV.LATB.EHZ. 2021-06-20T00:56:58.19 0.1 undecidable manual P 127 34.6431 50 -0.3 90
IV.RCAV.EHZ. 2021-06-20T00:56:57.99 0.1 undecidable manual P 55 32.0457 50 -0.09 95
IV.LAV9.HNE. 2021-06-20T00:56:56.53 0.1 undecidable manual S 94 5.7942 151 0.67 85
IV.SAMA.EHZ. 2021-06-20T00:56:56.40 0.1 undecidable manual S 345 11.3775 133 -0.67 84
IV.MA9.HHE. 2021-06-20T00:56:56.40 0.1 undecidable manual S 14 10.0788 136 -0.35 93
IV.ROM9.HNZ. 2021-06-20T00:56:56.18 0.1 positive manual P 330 18.7701 119 0.19 95
IV.RDP.HHZ. 2021-06-20T00:56:56.90 0.1 undecidable manual S 38 11.0778 134 -0.08 99
IV.VIVA.HHZ. 2021-06-20T00:56:55.39 0.1 negative manual P 57 13.9749 127 0.21 96
IV.RMP.HHZ. 2021-06-20T00:56:55.49 0.1 negative manual P 23 15.7731 124 0.01 99
IV.RDP.HHZ. 2021-06-20T00:56:54.92 0.1 negative manual P 38 11.0778 134 0.19 97
IV.LAV9.HNE. 2021-06-20T00:56:54.67 0.1 positive manual P 94 5.7942 151 0.58 88
IV.SAMA.EHZ. 2021-06-20T00:56:54.63 0.1 positive manual P 345 11.3775 133 -0.16 97
IV.MA9.HHE. 2021-06-20T00:56:54.62 0.1 undecidable manual P 14 10.0788 136 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RMP.HHE. ML:3.5 0.02875 0.18 AML other m 2021-06-20T00:56:58.09
IV.RDP.HHE. ML:2.6 0.00518 0.32 AML other m 2021-06-20T00:56:58.18
IV.RMP.HHN. ML:3.4 0.023850000000000003 0.18 AML other m 2021-06-20T00:56:58.10
IV.ROM9.HNE. ML:2.2 0.00133 0.4 AML other m 2021-06-20T00:56:59.71
IV.RDP.HHN. ML:2.7 0.00632 0.3 AML other m 2021-06-20T00:56:59.82
IV.VIVA.HHE. ML:3.0 0.009965 0.34 AML other m 2021-06-20T00:57:00.72
IV.VIVA.HHN. ML:3.0 0.009210000000000001 0.36 AML other m 2021-06-20T00:57:00.82
IV.ROM9.HNN. ML:2.4 0.0017900000000000001 0.58 AML other m 2021-06-20T00:57:03.64
IV.RCAV.EHE. ML:1.9 0.00038349999999999994 0.7 AML other m 2021-06-20T00:57:04.46
IV.RCAV.EHN. ML:1.9 0.0003565 1.4 AML other m 2021-06-20T00:57:04.90
IV.MTCE.HHN. ML:1.8 0.00022399999999999997 0.36 AML other m 2021-06-20T00:57:05.41
IV.LATB.EHE. ML:1.2 0.00006345000000000001 1.28 AML other m 2021-06-20T00:57:07.32
IV.MTCE.HHE. ML:1.7 0.000189 0.78 AML other m 2021-06-20T00:57:08.51
IV.CERT.HHE. ML:1.8 0.00020400000000000003 0.98 AML other m 2021-06-20T00:57:08.89
IV.CERT.HHN. ML:1.9 0.000245 0.34 AML other m 2021-06-20T00:57:08.52
IV.GIUL.HHE. ML:2.2 0.0003615 0.42 AML other m 2021-06-20T00:57:10.40
IV.GIUL.HHN. ML:2.3 0.0004735 0.24 AML other m 2021-06-20T00:57:10.13
IV.LATB.EHN. ML:1.0 0.00003895 1.02 AML other m 2021-06-20T00:57:10.22
IV.GUAR.HHE. ML:1.9 0.000176 0.68 AML other m 2021-06-20T00:57:11.49
IV.GUAR.HHN. ML:2.0 0.000193 0.26 AML other m 2021-06-20T00:57:13.60
IV.SRES.HHE. ML:1.9 0.000149 1.1 AML other m 2021-06-20T00:57:14.60
IV.SRES.HHN. ML:1.9 0.000161 1.68 AML other m 2021-06-20T00:57:14.93
IV.PTQR.HHE. ML:1.7 0.00007235 0.58 AML other m 2021-06-20T00:57:15.31
IV.LRP.EHN. ML:1.6 0.00005855000000000001 1.3 AML other m 2021-06-20T00:57:16.02
IV.LRP.EHE. ML:2.2 0.0002045 1.3 AML other m 2021-06-20T00:57:16.81
IV.BARO.EHE. ML:1.7 0.00006385000000000001 0.88 AML other m 2021-06-20T00:57:17.20
IV.PTQR.HHN. ML:1.7 0.00008685000000000001 0.58 AML other m 2021-06-20T00:57:18.03
IV.VVLD.HHE. ML:1.8 0.00008410000000000001 1.52 AML other m 2021-06-20T00:57:19.86
IV.BARO.EHN. ML:1.8 0.00008400000000000001 0.66 AML other m 2021-06-20T00:57:19.64
IV.VVLD.HHN. ML:2.1 0.00014600000000000003 0.4 AML other m 2021-06-20T00:57:21.38
IV.MCI.EHN. ML:2.2 0.00015550000000000004 0.72 AML other m 2021-06-20T00:57:25.00
IV.ARRO.EHN. ML:2.1 0.000122 0.72 AML other m 2021-06-20T00:57:25.83
IV.RM33.EHE. ML:2.0 0.0000967 0.7 AML other m 2021-06-20T00:57:26.97
IV.ARRO.EHE. ML:2.0 0.00009865 0.88 AML other m 2021-06-20T00:57:26.33
IV.MCI.EHE. ML:2.4 0.0002545 0.72 AML other m 2021-06-20T00:57:27.56
IV.GAVE.EHE. ML:2.2 0.0001325 0.32 AML other m 2021-06-20T00:57:28.30
IV.RM33.EHN. ML:2.1 0.00011855 0.62 AML other m 2021-06-20T00:57:28.18
IV.GAVE.EHN. ML:2.3 0.00016350000000000002 0.38 AML other m 2021-06-20T00:57:28.66
IV.INTR.HHE. ML:1.8 0.000057300000000000004 0.44 AML other m 2021-06-20T00:57:30.60
IV.SMA1.EHE. ML:2.2 0.000123 1.38 AML other m 2021-06-20T00:57:31.13
IV.SMA1.EHN. ML:2.3 0.00013700000000000002 0.56 AML other m 2021-06-20T00:57:33.55
IV.INTR.HHN. ML:2.1 0.00010250000000000001 0.74 AML other m 2021-06-20T00:57:35.67
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
Waveforms Seismic signals in miniseed + resp format Download