Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 18-04-2021 and time 18:37:57 (UTC) in region 11 km SW Gubbio (PG)

A magnitude ML 0.9 earthquake occured in region: 11 km SW Gubbio (PG), on

  • 18-04-2021 18:37:57 (UTC)
  • 18-04-2021 20:37:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2740, 12.5010 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
Gubbio PG 11 32216 32216
Umbertide PG 15 16681 48897
Valfabbrica PG 15 3389 52286
Montone PG 17 1680 53966
Pietralunga PG 20 2111 56077
Costacciaro PG 20 1216 57293
Scheggia e Pascelupo PG 20 1393 58686

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km NE of Perugia (166134 inhabitants)
39 Km NW of Foligno (57155 inhabitants)
54 Km E of Arezzo (99543 inhabitants)
76 Km SW of Fano (60888 inhabitants)
78 Km SW of Pesaro (94582 inhabitants)
80 Km N of Terni (111501 inhabitants)
88 Km S of Rimini (147750 inhabitants)
91 Km W of Ancona (100861 inhabitants)
95 Km E of Siena (53903 inhabitants)
98 Km S of Cesena (96758 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 2021-04-18
18:37:57		 43.2737 12.5008 10 2021-07-12
16:55:12		 Bollettino Sismico Italiano INGV 90296821
Reviewed
Rev100 		ML 0.9 2021-04-18
18:37:57		 43.2703 12.5005 10 2021-04-18
19:21:46		 Sala Sismica INGV-Roma 89227311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-18 18:37:57 ± 0.04
Latitude 43.2737 ± 0.0018
Longitude 12.5008 ± 0.0037
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 90296821

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 265
Semi-minor axis of confidence ellipse (meter) 221
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 284
Circular confidence region, given by single value of horizontal uncertainty (meter) 270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 46
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 33
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.60524
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 12
Type of magnitude ML
Reference to an origin 90296821
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-20 15:29:30

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 12
Type of magnitude ML
Reference to an origin 89227311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-18 19:21:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIR.HHZ. 2021-04-18T18:38:16.48 3.0 undecidable manual P 0.13 0
IV.MGAB.HHZ. 2021-04-18T18:38:14.44 0.6 undecidable manual S 218 50.9157 50 0.43 42
IV.SACS.HHE. 2021-04-18T18:38:09.68 1.0 undecidable manual P 226 67.1772 50 0.06 22
IV.FRON.EHZ. 2021-04-18T18:38:08.92 0.3 undecidable manual S 34 32.5452 50 -0.19 69
IV.PIEI.HHZ. 2021-04-18T18:38:08.03 0.3 undecidable manual S 5 29.2485 50 -0.17 69
IV.MOMA.HNZ. 2021-04-18T18:38:07.57 0.6 undecidable manual P 174 52.4031 50 0.23 44
IV.ASSB.HHZ. 2021-04-18T18:38:07.87 0.6 undecidable manual S 153 28.6491 50 -0.19 46
IV.SSFR.HHZ. 2021-04-18T18:38:07.82 0.3 undecidable manual S 51 29.0487 50 -0.33 67
IV.MGAB.HHZ. 2021-04-18T18:38:07.41 0.3 undecidable manual P 218 50.9157 50 0.29 65
IV.ATBU.EHZ. 2021-04-18T18:38:06.50 0.3 undecidable manual S 10 22.755 114 0.18 70
IV.ATSC.EHZ. 2021-04-18T18:38:06.15 0.3 undecidable manual S 42 22.4553 114 -0.06 72
IV.ATPC.HHZ. 2021-04-18T18:38:06.68 0.3 undecidable manual S 351 23.2545 113 0.2 70
IV.CAFI.HNN. 2021-04-18T18:38:05.94 0.1 undecidable manual P 278 43.623 50 -0.05 92
IV.ATPI.EHZ. 2021-04-18T18:38:05.70 0.6 undecidable manual S 338 21.1677 115 -0.12 47
IV.FOSV.EHZ. 2021-04-18T18:38:05.81 0.6 undecidable manual S 84 21.1677 115 0 48
IV.FRON.EHZ. 2021-04-18T18:38:04.24 1.0 positive manual P 34 32.5452 50 -0.05 24
IV.PIEI.HHZ. 2021-04-18T18:38:04.14 0.3 undecidable manual P 5 29.2485 50 0.37 66
IV.ATVA.EHZ. 2021-04-18T18:38:04.24 0.3 undecidable manual S 272 17.3715 120 -0.42 67
IV.ATCC.EHZ. 2021-04-18T18:38:03.91 0.3 undecidable manual S 131 14.9739 124 -0.02 73
IV.ASSB.HHZ. 2021-04-18T18:38:03.43 0.3 undecidable manual P 153 28.6491 50 -0.25 68
IV.SSFR.HHZ. 2021-04-18T18:38:03.59 0.1 undecidable manual P 51 29.0487 50 -0.14 93
IV.ATFO.HNE. 2021-04-18T18:38:03.14 0.3 undecidable manual S 29 11.7771 130 0.09 73
IV.ATPI.EHZ. 2021-04-18T18:38:02.41 0.1 undecidable manual P 338 21.1677 115 0.01 97
IV.ATPC.HHZ. 2021-04-18T18:38:02.86 0.3 undecidable manual P 351 23.2545 113 0.09 71
IV.FOSV.EHZ. 2021-04-18T18:38:02.49 0.1 undecidable manual P 84 21.1677 115 0.1 95
IV.ATBU.EHZ. 2021-04-18T18:38:02.89 0.3 undecidable manual P 10 22.755 114 0.21 69
IV.ATSC.EHZ. 2021-04-18T18:38:02.68 0.3 undecidable manual P 42 22.4553 114 0.06 72
IV.ATLO.HNZ. 2021-04-18T18:38:02.13 0.6 undecidable manual S 301 8.88 138 -0.19 48
IV.ATCC.EHZ. 2021-04-18T18:38:01.52 0.1 undecidable manual P 131 14.9739 124 0.23 94
IV.ATVA.EHZ. 2021-04-18T18:38:01.61 0.3 undecidable manual P 272 17.3715 120 -0.11 72
IV.ATLO.HNZ. 2021-04-18T18:38:00.46 0.1 undecidable manual P 301 8.88 138 0.09 97
IV.ATFO.HNE. 2021-04-18T18:38:00.89 0.3 undecidable manual P 29 11.7771 130 0.1 73
IV.MURB.HHZ. 2021-04-18T18:38:00.87 0.3 undecidable manual S 121 2.2977 167 -0.38 70
IV.MURB.HHZ. 2021-04-18T18:37:59.76 0.1 undecidable manual P 121 2.2977 167 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATCC.EHE. ML:1.0 0.00009109999999999999 0.3 AML other m 2021-04-18T18:38:05.58
IV.ATCC.EHN. ML:0.9 0.0000698 1.12 AML other m 2021-04-18T18:38:06.60
IV.FOSV.EHN. ML:0.8 0.00004795 0.58 AML other m 2021-04-18T18:38:06.06
IV.FOSV.EHE. ML:0.8 0.000049000000000000005 0.3 AML other m 2021-04-18T18:38:06.08
IV.ASSB.HHE. ML:0.8 0.0000292 0.78 AML other m 2021-04-18T18:38:08.52
IV.SSFR.HHN. ML:1.0 0.0000449 0.14 AML other m 2021-04-18T18:38:08.83
IV.SSFR.HHE. ML:1.0 0.00005475 0.16 AML other m 2021-04-18T18:38:08.89
IV.ASSB.HHN. ML:0.9 0.0000388 1.26 AML other m 2021-04-18T18:38:09.09
IV.FRON.EHE. ML:0.9 0.000036400000000000004 0.32 AML other m 2021-04-18T18:38:09.08
IV.PIEI.HHN. ML:0.8 0.000035799999999999996 0.18 AML other m 2021-04-18T18:38:09.20
IV.FRON.EHN. ML:1.0 0.0000405 0.3 AML other m 2021-04-18T18:38:09.32
IV.PIEI.HHE. ML:0.9 0.00004165000000000001 0.36 AML other m 2021-04-18T18:38:09.18
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