Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 25-03-2020 and time 03:42:09 (Italy) in region 3 km SW Ariccia (RM)

A magnitude ML 2.1 earthquake occured in region: 3 km SW Ariccia (RM), on

  • 25-03-2020 02:42:09 (UTC)
  • 25-03-2020 03:42:09 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.6960, 12.6510 at 13 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 3 19407 19407
Genzano di Roma RM 4 23970 43377
Albano Laziale RM 4 41715 85092
Lanuvio RM 5 13632 98724
Castel Gandolfo RM 6 8997 107721
Nemi RM 6 1943 109664
Marino RM 8 43026 152690
Rocca di Papa RM 9 17034 169724
Grottaferrata RM 11 20327 190051
Velletri RM 11 53303 243354
Aprilia LT 11 73446 316800
Frascati RM 13 22087 338887
Ciampino RM 13 38412 377299
Pomezia RM 13 62966 440265
Ardea RM 13 49183 489448
Rocca Priora RM 15 11962 501410
Monte Porzio Catone RM 15 8693 510103
Monte Compatri RM 15 11978 522081
Lariano RM 16 13432 535513
Colonna RM 18 4287 539800
Cisterna di Latina LT 19 36868 576668
San Cesareo RM 19 15153 591821

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km W of Velletri (53303 inhabitants)
11 Km N of Aprilia (73446 inhabitants)
13 Km E of Pomezia (62966 inhabitants)
26 Km SE of Roma (2864731 inhabitants)
28 Km N of Anzio (54211 inhabitants)
32 Km SW of Tivoli (56533 inhabitants)
33 Km NW of Latina (125985 inhabitants)
35 Km S of Guidonia Montecelio (88673 inhabitants)
35 Km E of Fiumicino (78395 inhabitants)
84 Km SE of Civitavecchia (52991 inhabitants)
92 Km SE of Viterbo (67173 inhabitants)
96 Km SW of L'Aquila (69753 inhabitants)
96 Km S of Terni (111501 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 2.1 2020-03-25
02:42:09		 41.6963 12.6512 13 2020-07-18
21:08:37		 Bollettino Sismico Italiano INGV 79620521
Reviewed
Rev100 		ML 2.0 2020-03-25
02:42:09		 41.6998 12.629 11 2020-03-25
02:52:14		 Sala Sismica INGV-Roma 77547141
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-03-25 02:42:09 ± 0.17
Latitude 41.6963 ± 0.0054
Longitude 12.6512 ± 0.0096
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 79620521

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 703
Semi-minor axis of confidence ellipse (meter) 543
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 250
Circular confidence region, given by single value of horizontal uncertainty (meter) 700.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 201
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 19
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.35253
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 77547141
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-03-25 02:52:14

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 79620521
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-06-24 16:33:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.APRC.HHZ. 2020-03-25T02:43:15.90 3.0 undecidable manual Sn 2.08 0
IT.GLNS.HNZ. 2020-03-25T02:43:01.73 3.0 undecidable manual Sn -0.82 0
IT.PLTA.HNZ. 2020-03-25T02:43:01.07 3.0 undecidable manual S 0.91 0
IV.SGTA.HNZ. 2020-03-25T02:42:44.40 3.0 undecidable manual Pn -0.04 0
IV.IFOR.HHZ. 2020-03-25T02:42:33.41 3.0 undecidable manual P -0.43 0
IV.CERT.HHE. 2020-03-25T02:42:21.45 0.6 undecidable manual S 44 39.1275 94 -0.6 40
IV.MTCE.HHZ. 2020-03-25T02:42:21.69 0.6 undecidable manual S 12 37.0296 95 0.21 46
IV.LATB.EHZ. 2020-03-25T02:42:20.37 0.3 undecidable manual S 131 34.2435 95 -0.37 66
IV.CERT.HHE. 2020-03-25T02:42:16.93 1.0 undecidable manual P 44 39.1275 94 0.34 22
IV.MTCE.HHZ. 2020-03-25T02:42:16.25 1.0 undecidable manual P 12 37.0296 95 -0.01 24
IV.LATB.EHZ. 2020-03-25T02:42:15.78 1.0 undecidable manual P 131 34.2435 95 -0.05 23
IV.RMP.HHZ. 2020-03-25T02:42:15.45 0.3 undecidable manual S 19 13.5753 119 0.06 74
IV.RCAV.EHZ. 2020-03-25T02:42:15.40 0.6 undecidable manual P 55 29.5482 97 0.29 46
IV.VIVA.HHZ. 2020-03-25T02:42:14.99 0.3 undecidable manual S 59 11.4774 126 0.06 74
IV.RDP.HHZ. 2020-03-25T02:42:14.26 0.3 undecidable manual S 35 8.5803 137 -0.09 73
IV.SAMA.EHZ. 2020-03-25T02:42:14.39 0.3 undecidable manual S 332 10.5783 129 -0.33 70
IV.MA9.HHZ. 2020-03-25T02:42:13.82 0.3 undecidable manual S 5 8.1807 139 -0.45 68
IV.LAV9.HHZ. 2020-03-25T02:42:13.93 0.3 undecidable manual S 117 4.4955 156 0.19 73
IV.SAMA.EHZ. 2020-03-25T02:42:12.28 0.1 undecidable manual P 332 10.5783 129 -0.08 98
IV.RMP.HHZ. 2020-03-25T02:42:12.95 0.1 undecidable manual P 19 13.5753 119 0.21 95
IV.VIVA.HHZ. 2020-03-25T02:42:12.79 0.1 undecidable manual P 59 11.4774 126 0.31 93
IV.RDP.HHZ. 2020-03-25T02:42:12.20 0.1 undecidable manual P 35 8.5803 137 0.06 99
IV.MA9.HHZ. 2020-03-25T02:42:12.14 0.1 undecidable manual P 5 8.1807 139 0.05 99
IV.LAV9.HHZ. 2020-03-25T02:42:11.81 0.1 undecidable manual P 117 4.4955 156 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RDP.HHE. ML:1.7 0.000607878 0.3792 AML other m 2020-03-25T02:42:14.43
IV.RDP.HHN. ML:1.8 0.0007238253499999999 0.1792 AML other m 2020-03-25T02:42:14.70
IV.LAV9.HNN. ML:2.1 0.001562871 0.2592 AML other m 2020-03-25T02:42:15.63
IV.LAV9.HHN. ML:2.1 0.0017245935000000001 0.24 AML other m 2020-03-25T02:42:15.64
IV.LAV9.HHE. ML:2.2 0.0018610880000000001 0.1984 AML other m 2020-03-25T02:42:15.57
IV.LAV9.HNE. ML:2.2 0.0019815248 0.2096 AML other m 2020-03-25T02:42:15.67
IV.RMP.HHN. ML:2.2 0.0014979915 0.1392 AML other m 2020-03-25T02:42:15.68
IV.VIVA.HHE. ML:2.0 0.00102917995 0.1808 AML other m 2020-03-25T02:42:15.76
IV.RMP.HHE. ML:2.1 0.001274396 0.1008 AML other m 2020-03-25T02:42:15.82
IV.VIVA.HHN. ML:2.1 0.0011868325 1.7808 AML other m 2020-03-25T02:42:17.05
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