Earthquake with magnitude of ML 2.0 on date 20-06-2021 and time 02:56:51 (Italy) 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) 41.681, 12.629 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.

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
Albano Laziale RM 6 41715 61122
Genzano di Roma RM 6 23970 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

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event *

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event *

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event *

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019 *

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire *

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
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
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
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

Field Value
Value 2
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

Field Value
Value 2
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 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 1.0288 50 1.22 41
IV.ARRO.EHZ. 2021-06-20T00:57:22.44 0.6 undecidable manual S 6 0.9029 50 1.45 25
IV.VVLD.HHZ. 2021-06-20T00:57:17.24 0.3 undecidable manual S 75 0.7644 50 0.35 61
IV.CFMN.HHZ. 2021-06-20T00:57:16.15 3.0 undecidable manual P 0.21 0
IV.LRP.EHZ. 2021-06-20T00:57:16.06 0.3 undecidable manual S 92 0.7159 50 0.61 57
IV.FIAM.HNN. 2021-06-20T00:57:15.54 0.6 undecidable manual S 32 0.6898 50 0.87 34
IV.PTQR.HHZ. 2021-06-20T00:57:14.34 0.3 undecidable manual S 59 0.6682 50 0.32 63
IV.SMA1.EHZ. 2021-06-20T00:57:13.05 0.6 undecidable manual P 29 1.0837 50 1.37 25
IV.TOLF.HHZ. 2021-06-20T00:57:12.12 0.3 undecidable manual S 309 0.6043 50 -0.02 68
IV.GAVE.EHZ. 2021-06-20T00:57:11.11 0.6 undecidable manual P 11 1.0288 50 0.35 38
IV.SRES.HHZ. 2021-06-20T00:57:11.00 0.3 undecidable manual S 351 0.5621 50 0.1 67
IV.MCI.EHZ. 2021-06-20T00:57:09.17 0.6 undecidable manual P 102 0.9056 50 0.53 38
IV.INTR.HHZ. 2021-06-20T00:57:09.89 0.6 undecidable manual P 70 1.0054 50 -0.46 38
IV.RM33.EHZ. 2021-06-20T00:57:09.87 0.3 undecidable manual P 28 0.9344 50 0.74 52
IV.ARRO.EHZ. 2021-06-20T00:57:09.46 0.3 undecidable manual P 6 0.9029 50 0.86 50
IV.GUAR.HHZ. 2021-06-20T00:57:09.51 0.3 undecidable manual S 77 0.5225 50 -0.2 66
IV.GIUL.HHZ. 2021-06-20T00:57:08.39 0.3 undecidable manual S 105 0.4838 50 -0.17 67
IV.LRP.EHZ. 2021-06-20T00:57:05.04 0.1 undecidable manual P 92 0.7159 50 -0.36 82
IV.VVLD.HHZ. 2021-06-20T00:57:05.69 0.1 negative manual P 75 0.7644 50 -0.54 78
IV.BARO.EHZ. 2021-06-20T00:57:05.54 0.1 undecidable manual P 323 0.7105 50 0.23 84
IV.PTQR.HHZ. 2021-06-20T00:57:04.08 0.1 negative manual P 59 0.6682 50 -0.5 81
IV.FIAM.HNN. 2021-06-20T00:57:04.52 0.1 positive manual P 32 0.6898 50 -0.43 81
IV.CERT.HHZ. 2021-06-20T00:57:04.90 0.6 undecidable manual S 44 0.375 50 -0.45 43
IV.MTCE.HHZ. 2021-06-20T00:57:03.60 0.6 undecidable manual S 14 0.3516 50 -1.05 34
IV.LATB.EHZ. 2021-06-20T00:57:03.50 0.6 undecidable manual S 127 0.3121 50 0.02 48
IV.TOLF.HHZ. 2021-06-20T00:57:03.36 0.1 undecidable manual P 309 0.6043 50 -0.13 88
IV.SRES.HHZ. 2021-06-20T00:57:02.36 0.3 undecidable manual P 351 0.5621 50 -0.41 63
IV.GUAR.HHZ. 2021-06-20T00:57:02.01 0.3 undecidable manual P 77 0.5225 50 -0.07 68
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 0.5405 50 -0.07 68
IV.GIUL.HHZ. 2021-06-20T00:57:01.04 0.1 undecidable manual P 105 0.4838 50 -0.38 86
IV.CERT.HHZ. 2021-06-20T00:56:59.04 0.1 negative manual P 44 0.375 50 -0.53 85
IV.RMP.HHZ. 2021-06-20T00:56:58.00 0.6 undecidable manual S 23 0.1421 124 -0.26 47
IV.MTCE.HHZ. 2021-06-20T00:56:58.58 0.1 undecidable manual P 14 0.3516 50 -0.58 83
IV.LATB.EHZ. 2021-06-20T00:56:58.19 0.1 undecidable manual P 127 0.3121 50 -0.3 90
IT.RMMM.HGE. 2021-06-20T00:56:58.56 0.3 undecidable manual P 332 0.2752 50 0.7 60
IT.RMVT.HGE. 2021-06-20T00:56:58.33 3.0 undecidable manual P 0.23 0
IV.RCAV.EHZ. 2021-06-20T00:56:57.99 0.1 undecidable manual P 55 0.2887 50 -0.09 95
IV.SAMA.EHZ. 2021-06-20T00:56:56.40 0.1 undecidable manual S 345 0.1025 133 -0.67 84
IV.MA9.HHE. 2021-06-20T00:56:56.40 0.1 undecidable manual S 14 0.0908 136 -0.35 93
IV.ROM9.HNZ. 2021-06-20T00:56:56.18 0.1 positive manual P 330 0.1691 119 0.19 95
IV.RDP.HHZ. 2021-06-20T00:56:56.90 0.1 undecidable manual S 38 0.0998 134 -0.08 99
IV.LAV9.HNE. 2021-06-20T00:56:56.53 0.1 undecidable manual S 94 0.0522 151 0.67 85
IV.RMP.HHZ. 2021-06-20T00:56:55.49 0.1 negative manual P 23 0.1421 124 0.01 99
IV.VIVA.HHZ. 2021-06-20T00:56:55.39 0.1 negative manual P 57 0.1259 127 0.21 96
IV.RDP.HHZ. 2021-06-20T00:56:54.92 0.1 negative manual P 38 0.0998 134 0.19 97
IV.LAV9.HNE. 2021-06-20T00:56:54.67 0.1 positive manual P 94 0.0522 151 0.58 88
IV.SAMA.EHZ. 2021-06-20T00:56:54.63 0.1 positive manual P 345 0.1025 133 -0.16 97
IV.MA9.HHE. 2021-06-20T00:56:54.62 0.1 undecidable manual P 14 0.0908 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 0.02385 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 0.009965 0.34 AML other m 2021-06-20T00:57:00.72
IV.VIVA.HHN. ML:3 0.00921 0.36 AML other m 2021-06-20T00:57:00.82
IV.ROM9.HNN. ML:2.4 0.00179 0.58 AML other m 2021-06-20T00:57:03.64
IV.RCAV.EHE. ML:1.9 0.0003835 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 0.000224 0.36 AML other m 2021-06-20T00:57:05.41
IV.LATB.EHE. ML:1.2 6.345E-5 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 0.000204 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 3.895E-5 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 0.000193 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 7.235E-5 0.58 AML other m 2021-06-20T00:57:15.31
IV.LRP.EHN. ML:1.6 5.855E-5 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 6.385E-5 0.88 AML other m 2021-06-20T00:57:17.20
IV.PTQR.HHN. ML:1.7 8.685E-5 0.58 AML other m 2021-06-20T00:57:18.03
IV.VVLD.HHE. ML:1.8 8.41E-5 1.52 AML other m 2021-06-20T00:57:19.86
IV.BARO.EHN. ML:1.8 8.4E-5 0.66 AML other m 2021-06-20T00:57:19.64
IV.VVLD.HHN. ML:2.1 0.000146 0.4 AML other m 2021-06-20T00:57:21.38
IV.MCI.EHN. ML:2.2 0.0001555 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 9.67E-5 0.7 AML other m 2021-06-20T00:57:26.97
IV.ARRO.EHE. ML:2 9.865E-5 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 0.0001635 0.38 AML other m 2021-06-20T00:57:28.66
IV.INTR.HHE. ML:1.8 5.73E-5 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 0.000137 0.56 AML other m 2021-06-20T00:57:33.55
IV.INTR.HHN. ML:2.1 0.0001025 0.74 AML other m 2021-06-20T00:57:35.67
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions *

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
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