Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 12-04-2021 and time 22:48:22 (Italy) in region 5 km NW Spoleto (PG)

A magnitude ML 1.3 earthquake occured in region: 5 km NW Spoleto (PG), on

  • 12-04-2021 20:48:22 (UTC)
  • 12-04-2021 22:48:22 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7770, 12.7140 at 4 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 5 38218 38218
Castel Ritaldi PG 6 3278 41496
Campello sul Clitunno PG 7 2442 43938
Sant'Anatolia di Narco PG 11 564 44502
Trevi PG 12 8469 52971
Scheggino PG 12 461 53432
Vallo di Nera PG 12 364 53796
Giano dell'Umbria PG 13 3846 57642
Montefalco PG 14 5679 63321
Massa Martana PG 16 3770 67091
Acquasparta TR 17 4778 71869
Cerreto di Spoleto PG 17 1075 72944
Ferentillo TR 18 1913 74857
Poggiodomo PG 19 117 74974
Bevagna PG 20 5081 80055
Gualdo Cattaneo PG 20 6155 86210
Foligno PG 20 57155 143365

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km S of Foligno (57155 inhabitants)
25 Km N of Terni (111501 inhabitants)
45 Km SE of Perugia (166134 inhabitants)
64 Km NE of Viterbo (67173 inhabitants)
73 Km NW of L'Aquila (69753 inhabitants)
82 Km W of Teramo (54892 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
91 Km N of Tivoli (56533 inhabitants)
100 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 1.3 2021-04-12
20:48:22		 42.7767 12.7145 4 2021-04-12
21:16:04		 Sala Sismica INGV-Roma 89042911
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-12 20:48:22 ± 0.2
Latitude 42.7767 ± 0.0036
Longitude 12.7145 ± 0.0049
Depth (km) 4 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 89042911

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 370
Semi-minor axis of confidence ellipse (meter) 304
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 23
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.29857
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 89042911
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-12 21:16:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SACS.HHZ. 2021-04-12T20:48:41.73 3.0 undecidable manual S -0.2 0
IV.NRCA.HHZ. 2021-04-12T20:48:33.74 0.6 undecidable manual S 79 33.1446 97 0.06 49
IV.LNSS.HHZ. 2021-04-12T20:48:33.43 0.6 undecidable manual S 126 32.8449 97 -0.15 48
IV.ASSB.HHZ. 2021-04-12T20:48:32.85 0.6 undecidable manual S 351 29.8479 98 0.3 46
IV.CESI.HHZ. 2021-04-12T20:48:32.42 0.6 undecidable manual S 31 29.6481 98 -0.06 49
IV.CESI.HHZ. 2021-04-12T20:48:28.03 1.0 positive manual P 31 29.6481 98 -0.06 24
IV.NRCA.HHZ. 2021-04-12T20:48:28.80 1.0 negative manual P 79 33.1446 97 0.01 25
IV.LNSS.HHZ. 2021-04-12T20:48:28.80 1.0 undecidable manual P 126 32.8449 97 0.07 24
IV.ASSB.HHZ. 2021-04-12T20:48:27.90 0.6 undecidable manual P 351 29.8479 98 -0.23 47
IV.ARRO.EHZ. 2021-04-12T20:48:26.91 0.6 negative manual P 169 22.2555 101 0.27 47
IV.MOMA.HHZ. 2021-04-12T20:48:26.57 0.6 undecidable manual S 284 12.1767 109 0.02 51
IV.MOMA.HHZ. 2021-04-12T20:48:24.57 0.1 positive manual P 284 12.1767 109 -0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HNN. ML:1.3 0.00030500000000000004 0.88 AML other m 2021-04-12T20:48:27.46
IV.MOMA.HHE. ML:1.4 0.00035950000000000006 0.62 AML other m 2021-04-12T20:48:28.01
IV.MOMA.HNE. ML:1.4 0.0003685 0.62 AML other m 2021-04-12T20:48:28.01
IV.MOMA.HHN. ML:1.3 0.00028000000000000003 0.2 AML other m 2021-04-12T20:48:28.36
IV.LNSS.HHE. ML:1.3 0.0001012 0.94 AML other m 2021-04-12T20:48:34.51
IV.LNSS.HHN. ML:1.2 0.00007745 0.58 AML other m 2021-04-12T20:48:36.64
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