Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 20-02-2021 and time 14:14:16 (UTC) in region 1 km N Spoleto (PG)

A magnitude ML 1.1 earthquake occured in region: 1 km N Spoleto (PG), on

  • 20-02-2021 14:14:16 (UTC)
  • 20-02-2021 15:14:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7480, 12.7410 at 10 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.

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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
Spoleto PG 1 38218 38218
Sant'Anatolia di Narco PG 8 564 38782
Scheggino PG 8 461 39243
Campello sul Clitunno PG 9 2442 41685
Castel Ritaldi PG 10 3278 44963
Vallo di Nera PG 10 364 45327
Trevi PG 15 8469 53796
Ferentillo TR 15 1913 55709
Giano dell'Umbria PG 16 3846 59555
Poggiodomo PG 16 117 59672
Cerreto di Spoleto PG 17 1075 60747
Montefranco TR 17 1276 62023
Acquasparta TR 17 4778 66801
Montefalco PG 18 5679 72480
Massa Martana PG 18 3770 76250
Arrone TR 18 2763 79013
Polino TR 20 233 79246

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NE of Terni (111501 inhabitants)
23 Km S of Foligno (57155 inhabitants)
49 Km SE of Perugia (166134 inhabitants)
64 Km NE of Viterbo (67173 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
79 Km W of Teramo (54892 inhabitants)
83 Km N of Guidonia Montecelio (88673 inhabitants)
87 Km N of Tivoli (56533 inhabitants)
97 Km N of Roma (2864731 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 2021-02-20
14:14:16		 42.7482 12.7407 10 2021-02-20
14:20:53		 Sala Sismica INGV-Roma 87325351
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-20 14:14:16 ± 0.06
Latitude 42.7482 ± 0.0054
Longitude 12.7407 ± 0.0061
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87325351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 621
Semi-minor axis of confidence ellipse (meter) 389
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 220
Circular confidence region, given by single value of horizontal uncertainty (meter) 620.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.48294
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 87325351
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-20 14:20:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.BHB.HHZ. 2021-02-20T14:15:49.18 3.0 undecidable manual Sg 15.51 0
IV.ERC.EHZ. 2021-02-20T14:15:29.73 3.0 undecidable manual Pg 11 0
MN.CLTB.HHZ. 2021-02-20T14:15:27.80 3.0 positive manual Pn 2.34 0
IV.ORI.HHZ. 2021-02-20T14:15:27.14 3.0 undecidable manual Pg 19.200001 0
IV.ZONE.HHZ. 2021-02-20T14:15:21.65 3.0 undecidable manual Sg 14.53 0
IV.TDS.HHZ. 2021-02-20T14:15:18.56 3.0 undecidable manual Pn 7.23 0
IV.SARZ.HHZ. 2021-02-20T14:15:14.65 3.0 undecidable manual Sg 4.88 0
GU.CANO.HHZ. 2021-02-20T14:15:13.96 3.0 undecidable manual Sn -2.39 0
IV.EUCT.HNZ. 2021-02-20T14:15:08.25 3.0 undecidable manual Sn -1.73 0
IV.VIVA.HHZ. 2021-02-20T14:15:06.85 3.0 undecidable manual Sg 2.44 0
OT.OT05.EHZ. 2021-02-20T14:15:00.50 3.0 undecidable manual Pg 13.27 0
IV.MRVN.HHZ. 2021-02-20T14:14:54.34 3.0 undecidable manual Pn -2.2 0
ST.PANI.EHZ. 2021-02-20T14:14:42.19 3.0 positive manual Pg 9.24 0
IV.CRTC.HHZ. 2021-02-20T14:14:39.54 3.0 undecidable manual Sg -0.59 0
IV.MTRZ.HNZ. 2021-02-20T14:14:39.36 3.0 undecidable manual Sg -1 0
IV.CSP1.EHZ. 2021-02-20T14:14:33.54 0.1 undecidable manual S 45 53.6019 50 0.41 86
IV.FDMO.HHZ. 2021-02-20T14:14:30.12 0.1 undecidable manual S 41 42.624 50 -0.07 94
IV.MC2.EHZ. 2021-02-20T14:14:29.69 0.1 undecidable manual S 63 40.7259 50 0.01 96
IV.CESI.HHZ. 2021-02-20T14:14:27.02 0.1 undecidable manual S 25 31.4463 50 -0.19 94
IV.CSP1.EHZ. 2021-02-20T14:14:26.14 0.1 undecidable manual P 45 53.6019 50 0.19 90
IV.MC2.EHZ. 2021-02-20T14:14:24.27 0.1 undecidable manual P 63 40.7259 50 0.31 90
IV.CESX.HHZ. 2021-02-20T14:14:24.00 0.1 undecidable manual S 219 19.9689 117 0.1 97
IV.ARRO.EHZ. 2021-02-20T14:14:23.51 0.1 undecidable manual S 174 18.87 118 -0.05 98
IV.FDMO.HHZ. 2021-02-20T14:14:23.67 0.1 undecidable manual P 41 42.624 50 -0.58 83
IT.GNU.HGN. 2021-02-20T14:14:22.71 0.1 undecidable manual S 294 15.1737 124 0.24 95
IV.CESI.HHZ. 2021-02-20T14:14:22.45 0.1 undecidable manual P 25 31.4463 50 -0.08 96
IV.GAVE.EHZ. 2021-02-20T14:14:22.18 0.1 undecidable manual S 116 13.9749 126 0.06 99
IV.MOMA.HHZ. 2021-02-20T14:14:22.29 0.1 undecidable manual S 294 15.1737 124 -0.18 96
IV.MTRZ.HNZ. 2021-02-20T14:14:20.35 3.0 undecidable manual P 1.22 0
IV.CESX.HHZ. 2021-02-20T14:14:20.40 0.1 undecidable manual P 219 19.9689 117 -0.22 95
IV.ARRO.EHZ. 2021-02-20T14:14:20.57 0.1 undecidable manual P 174 18.87 118 0.14 97
IV.GAVE.EHZ. 2021-02-20T14:14:19.39 0.1 undecidable manual P 116 13.9749 126 -0.2 96
IV.MOMA.HHZ. 2021-02-20T14:14:19.90 0.1 positive manual P 294 15.1737 124 0.1 98
IV.IMOL.EHZ. 2021-02-20T14:14:19.90 3.0 negative manual P 1.23 0
IT.GNU.HGN. 2021-02-20T14:14:19.80 0.1 undecidable manual P 294 15.1737 124 0.01 100
GU.CARD.HHZ. 2021-02-20T14:14:17.11 3.0 undecidable manual Pn -5.39 0
IV.SFI.EHZ. 2021-02-20T14:14:16.26 3.0 undecidable manual P -1.4 0
IV.ASQU.HHZ. 2021-02-20T14:14:16.31 3.0 undecidable manual P -1.44 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.0 0.00010600000000000002 1.3 AML other m 2021-02-20T14:14:22.85
IV.MOMA.HHN. ML:1.0 0.00009120000000000001 0.2 AML other m 2021-02-20T14:14:22.88
IV.CESI.HHN. ML:1.3 0.0000843 0.12 AML other m 2021-02-20T14:14:27.45
IV.CESI.HHE. ML:0.9 0.000036450000000000005 0.56 AML other m 2021-02-20T14:14:27.83
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