Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 25-04-2021 and time 23:53:18 (UTC) in region 5 km W Fonte Nuova (RM)

A magnitude ML 0.9 earthquake occured in region: 5 km W Fonte Nuova (RM), on

  • 25-04-2021 23:53:18 (UTC)
  • 26-04-2021 01:53:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.9900, 12.5640 at 10 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
Fonte Nuova RM 5 32562 32562
Mentana RM 8 22921 55483
Monterotondo RM 8 40830 96313
Riano RM 12 10466 106779
Roma RM 13 2864731 2971510
Sant'Angelo Romano RM 13 5018 2976528
Guidonia Montecelio RM 14 88673 3065201
Castelnuovo di Porto RM 16 8630 3073831
Sacrofano RM 16 7740 3081571
Formello RM 17 12918 3094489
Capena RM 17 10592 3105081
Morlupo RM 18 8696 3113777
Palombara Sabina RM 19 13269 3127046
Tivoli RM 20 56533 3183579

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km NE of Roma (2864731 inhabitants)
14 Km W of Guidonia Montecelio (88673 inhabitants)
20 Km W of Tivoli (56533 inhabitants)
36 Km N of Pomezia (62966 inhabitants)
36 Km NE of Fiumicino (78395 inhabitants)
38 Km NW of Velletri (53303 inhabitants)
45 Km N of Aprilia (73446 inhabitants)
60 Km N of Anzio (54211 inhabitants)
61 Km SE of Viterbo (67173 inhabitants)
64 Km S of Terni (111501 inhabitants)
65 Km NW of Latina (125985 inhabitants)
65 Km E of Civitavecchia (52991 inhabitants)
80 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 0.9 2021-04-25
23:53:18		 41.9903 12.5645 10 2021-07-12
16:55:10		 Bollettino Sismico Italiano INGV 90007771
Reviewed
Rev100 		ML 0.9 2021-04-25
23:53:18		 41.9855 12.5622 10 2021-04-26
00:02:41		 Sala Sismica INGV-Roma 89479381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-25 23:53:18 ± 0.05
Latitude 41.9903 ± 0.0036
Longitude 12.5645 ± 0.0036
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90007771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 377
Semi-minor axis of confidence ellipse (meter) 274
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 208
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 85
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) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.06745
Epicentral distance of station farthest from the epicenter (degree) 0.45955
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 90007771
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-12 02:21:39

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 89479381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-26 00:02:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BARO.HNZ. 2021-04-25T23:53:35.66 0.6 undecidable manual S 304 51.0156 50 0.5 42
IV.TOLF.HHZ. 2021-04-25T23:53:33.92 0.6 undecidable manual S 280 47.2194 50 -0.23 45
IV.RCAV.EHZ. 2021-04-25T23:53:30.90 0.6 undecidable manual S 117 35.2425 50 -0.05 47
IV.CERT.HHZ. 2021-04-25T23:53:30.72 0.6 undecidable manual S 97 34.743 50 -0.1 47
IV.RDP.HHZ. 2021-04-25T23:53:29.38 0.6 undecidable manual S 155 28.2495 50 0.31 45
IV.SRES.HHZ. 2021-04-25T23:53:28.97 0.6 undecidable manual S 351 27.75 50 0.02 48
IV.BARO.HNZ. 2021-04-25T23:53:28.35 0.3 undecidable manual P 304 51.0156 50 0.11 68
IV.MA9.HHE. 2021-04-25T23:53:28.21 0.6 undecidable manual S 162 25.6521 111 -0.12 48
IV.TOLF.HHZ. 2021-04-25T23:53:27.69 0.3 undecidable manual P 280 47.2194 50 0.03 70
IV.SAMA.EHZ. 2021-04-25T23:53:27.57 0.6 undecidable manual S 174 23.3544 113 -0.02 49
IV.RMP.HHZ. 2021-04-25T23:53:27.80 0.6 undecidable manual S 150 22.9548 113 0.35 45
IV.CERT.HHZ. 2021-04-25T23:53:25.49 0.1 undecidable manual P 97 34.743 50 -0.24 91
IV.MTCE.HHZ. 2021-04-25T23:53:25.25 0.6 undecidable manual S 76 15.0738 123 0.22 47
IV.RCAV.EHZ. 2021-04-25T23:53:25.45 1.0 undecidable manual P 117 35.2425 50 -0.36 22
IV.MA9.HHE. 2021-04-25T23:53:24.35 0.3 undecidable manual P 162 25.6521 111 0.05 72
IV.SRES.HHZ. 2021-04-25T23:53:24.51 0.1 undecidable manual P 351 27.75 50 -0.15 94
IV.RDP.HHZ. 2021-04-25T23:53:24.98 0.3 undecidable manual P 155 28.2495 50 0.25 69
IV.RMP.HHZ. 2021-04-25T23:53:23.83 0.3 undecidable manual P 150 22.9548 113 0.04 73
IT.RMVT.HGN. 2021-04-25T23:53:23.05 0.6 undecidable manual S 240 7.4814 142 -0.02 50
IV.SAMA.EHZ. 2021-04-25T23:53:23.48 0.3 undecidable manual P 174 23.3544 113 -0.4 67
IV.MTCE.HHZ. 2021-04-25T23:53:22.46 0.1 positive manual P 76 15.0738 123 0.06 98
IT.RMVT.HGN. 2021-04-25T23:53:21.24 0.1 undecidable manual P 240 7.4814 142 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTCE.HHE. ML:0.7 0.0000505 0.74 AML other m 2021-04-25T23:53:25.16
IV.MTCE.HHN. ML:0.9 0.00007039999999999999 0.36 AML other m 2021-04-25T23:53:25.73
IV.RMP.HHE. ML:1.5 0.0001955 0.32 AML other m 2021-04-25T23:53:29.21
IV.RDP.HHN. ML:1.2 0.00008124999999999998 0.48 AML other m 2021-04-25T23:53:29.51
IV.RDP.HHE. ML:0.9 0.00003925 0.28 AML other m 2021-04-25T23:53:30.41
IV.SRES.HHE. ML:0.4 0.00001467 0.66 AML other m 2021-04-25T23:53:30.42
IV.CERT.HHN. ML:0.9 0.000032500000000000004 0.48 AML other m 2021-04-25T23:53:31.20
IV.SRES.HHN. ML:0.4 0.000014999999999999999 0.9 AML other m 2021-04-25T23:53:31.71
IV.RMP.HHN. ML:1.4 0.000151 1.3 AML other m 2021-04-25T23:53:32.00
IV.TOLF.HHN. ML:1.1 0.000034200000000000005 0.76 AML other m 2021-04-25T23:53:34.13
IV.CERT.HHE. ML:0.6 0.0000158 0.42 AML other m 2021-04-25T23:53:34.97
IV.TOLF.HHE. ML:1.0 0.000026700000000000002 0.84 AML other m 2021-04-25T23:53:37.30
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