Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 16-04-2021 and time 15:54:52 (Italy) in region 3 km N Sant'Anatolia di Narco (PG)

A magnitude ML 1.1 earthquake occured in region: 3 km N Sant'Anatolia di Narco (PG), on

  • 16-04-2021 13:54:52 (UTC)
  • 16-04-2021 15:54:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7610, 12.8280 at 11 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Vallo di Nera PG 3 364 364
Sant'Anatolia di Narco PG 3 564 928
Scheggino PG 5 461 1389
Spoleto PG 8 38218 39607
Campello sul Clitunno PG 8 2442 42049
Cerreto di Spoleto PG 10 1075 43124
Poggiodomo PG 10 117 43241
Castel Ritaldi PG 14 3278 46519
Trevi PG 15 8469 54988
Monteleone di Spoleto PG 16 599 55587
Ferentillo TR 16 1913 57500
Cascia PG 16 3217 60717
Sellano PG 17 1079 61796
Montefranco TR 19 1276 63072
Polino TR 20 233 63305

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SE of Foligno (57155 inhabitants)
27 Km NE of Terni (111501 inhabitants)
53 Km SE of Perugia (166134 inhabitants)
65 Km NW of L'Aquila (69753 inhabitants)
70 Km NE of Viterbo (67173 inhabitants)
73 Km W of Teramo (54892 inhabitants)
85 Km N of Guidonia Montecelio (88673 inhabitants)
89 Km N of Tivoli (56533 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
Reviewed
Rev100 		ML 1.1 2021-04-16
13:54:52		 42.7607 12.8275 11 2021-04-16
14:07:49		 Sala Sismica INGV-Roma 89148201
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-16 13:54:52 ± 0.05
Latitude 42.7607 ± 0.0027
Longitude 12.8275 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 89148201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 258
Semi-minor axis of confidence ellipse (meter) 239
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 236
Circular confidence region, given by single value of horizontal uncertainty (meter) 260.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.43078
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 11
Type of magnitude ML
Reference to an origin 89148201
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-16 14:07:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAGA.HHZ. 2021-04-16T13:55:59.20 3.0 undecidable manual Sn 2.89 0
IV.HVZN.HNZ. 2021-04-16T13:55:57.09 3.0 undecidable manual Sn 0.45 0
OX.DRE.HHZ. 2021-04-16T13:55:53.95 3.0 undecidable manual Sn -9.99 0
IV.MRGE.HHZ. 2021-04-16T13:55:39.84 3.0 positive manual Pn 6.57 0
IV.CELI.HHZ. 2021-04-16T13:55:28.02 3.0 undecidable manual Sn 0.56 0
IV.SARZ.HHZ. 2021-04-16T13:55:25.29 3.0 positive manual Pg 13.13 0
IV.CADC.EHZ. 2021-04-16T13:55:20.68 3.0 negative manual Pg 9.61 0
IV.HPAC.HHZ. 2021-04-16T13:55:18.06 3.0 undecidable manual Pn 5.63 0
IV.RIBO.EHZ.01 2021-04-16T13:55:16.39 3.0 undecidable manual Sg 3.79 0
IV.NDIM.HNZ. 2021-04-16T13:55:14.08 3.0 positive manual Pg 13.12 0
IV.MILN.HNZ. 2021-04-16T13:55:11.50 3.0 undecidable manual Pn -4.72 0
IV.CSP1.EHZ. 2021-04-16T13:55:08.39 0.3 undecidable manual S 40 47.8188 50 0.2 69
IV.PZUN.HHZ. 2021-04-16T13:55:06.80 3.0 undecidable manual Sn 3.87 0
IV.ASSB.HHZ. 2021-04-16T13:55:04.44 0.3 undecidable manual S 336 34.1436 50 -0.09 72
IV.CESX.HHZ. 2021-04-16T13:55:02.31 0.3 undecidable manual S 229 25.8519 50 -0.01 74
IV.TDS.HHZ. 2021-04-16T13:55:02.41 3.0 undecidable manual Pg 16.57 0
IV.CESI.HHZ. 2021-04-16T13:55:02.87 0.3 undecidable manual S 13 27.8499 50 0.03 74
IV.CSP1.EHZ. 2021-04-16T13:55:01.55 0.6 undecidable manual P 40 47.8188 50 -0.2 46
IV.LNSS.HNE. 2021-04-16T13:55:01.92 0.3 undecidable manual S 135 24.6531 50 -0.07 74
IV.MOMA.HHZ. 2021-04-16T13:55:01.20 0.3 undecidable manual S 283 21.4674 50 0.05 74
IV.ASSB.HHZ. 2021-04-16T13:54:59.91 1.0 undecidable manual P 336 34.1436 50 0.27 23
IV.CESX.HHZ. 2021-04-16T13:54:58.65 1.0 undecidable manual P 229 25.8519 50 0.29 23
IV.LNSS.HNE. 2021-04-16T13:54:58.19 0.3 undecidable manual P 135 24.6531 50 0.02 74
IV.CESI.HHZ. 2021-04-16T13:54:58.52 0.1 undecidable manual P 13 27.8499 50 -0.14 96
IV.MOMA.HHZ. 2021-04-16T13:54:57.64 0.1 undecidable manual P 283 21.4674 50 -0.05 99
IV.GAVE.EHZ. 2021-04-16T13:54:57.89 0.3 undecidable manual S 144 9.2796 140 -0.08 75
IV.GAVE.EHZ. 2021-04-16T13:54:55.95 0.1 undecidable manual P 144 9.2796 140 0.1 100
IT.LRNO.HNZ. 2021-04-16T13:54:48.40 3.0 undecidable manual Sg -0.65 0
IV.LPEL.HHZ. 2021-04-16T13:54:45.20 3.0 undecidable manual Sg 0.78 0
IV.FIR.HHZ. 2021-04-16T13:54:45.67 3.0 undecidable manual Pn -1.43 0
IV.LRP.EHZ. 2021-04-16T13:54:42.87 3.0 undecidable manual Sg 3.61 0
IV.ATMI.HHZ. 2021-04-16T13:54:41.87 3.0 negative manual Pg 3.94 0
IV.GIUL.HHZ. 2021-04-16T13:54:37.50 3.0 undecidable manual Sg -1.62 0
OT.OT14.EHZ. 2021-04-16T13:54:34.00 3.0 negative manual Pn -1.13 0
IV.MNTT.EHZ. 2021-04-16T13:54:33.74 3.0 undecidable manual Pg 1.06 0
IV.PAOL.HHZ. 2021-04-16T13:54:25.53 3.0 negative manual P 0.04 0
IV.BSSO.HHZ. 2021-04-16T13:54:24.01 3.0 undecidable manual P -1.13 0
IV.LPEL.HHZ. 2021-04-16T13:54:22.52 3.0 negative manual P -2.51 0
IV.RNI2.HHZ. 2021-04-16T13:54:21.50 3.0 positive manual P -1.97 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:1.4 0.0002929209 0.1408 AML other m 2021-04-16T13:54:58.54
IV.MOMA.HHN. ML:0.7 0.000037197210000000004 0.1152 AML other m 2021-04-16T13:55:02.38
IV.CESX.HHE. ML:1.1 0.0000688 0.72 AML other m 2021-04-16T13:55:02.69
IV.CESX.HHN. ML:1.2 0.0000963 1.38 AML other m 2021-04-16T13:55:02.20
IV.CESI.HHE. ML:1.1 0.00006469999999999999 0.36 AML other m 2021-04-16T13:55:03.08
IV.MOMA.HHE. ML:0.8 0.00004242614 0.1792 AML other m 2021-04-16T13:55:02.81
IV.CESI.HHN. ML:1.0 0.00005685 0.52 AML other m 2021-04-16T13:55:03.48
IV.ASSB.HHE. ML:1.2 0.0000715 0.62 AML other m 2021-04-16T13:55:04.94
IV.ASSB.HHN. ML:1.2 0.0000632 0.74 AML other m 2021-04-16T13:55:05.47
IV.GAVE.HNE. ML:1.4 0.00030334635 0.16 AML other m 2021-04-16T13:54:58.31
IV.GAVE.HNN. ML:0.9 0.0000906499 0.8 AML other m 2021-04-16T13:54:59.91
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