Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 21-04-2021 and time 21:30:45 (UTC) in region 3 km NE Sigillo (PG)

A magnitude ML 0.9 earthquake occured in region: 3 km NE Sigillo (PG), on

  • 21-04-2021 21:30:45 (UTC)
  • 21-04-2021 23:30:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.3530, 12.7680 at 13 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
Sigillo PG 3 2404 2404
Costacciaro PG 5 1216 3620
Fossato di Vico PG 7 2840 6460
Scheggia e Pascelupo PG 10 1393 7853
Fabriano AN 11 31480 39333
Sassoferrato AN 12 7285 46618
Gualdo Tadino PG 14 15208 61826
Gubbio PG 15 32216 94042
Serra Sant'Abbondio PU 15 1027 95069
Genga AN 16 1797 96866
Cantiano PU 18 2245 99111
Cerreto d'Esi AN 18 3817 102928
Frontone PU 18 1300 104228
Esanatoglia MC 18 2034 106262

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km NE of Perugia (166134 inhabitants)
44 Km N of Foligno (57155 inhabitants)
58 Km SW of Fano (60888 inhabitants)
63 Km S of Pesaro (94582 inhabitants)
67 Km W of Ancona (100861 inhabitants)
73 Km E of Arezzo (99543 inhabitants)
81 Km S of Rimini (147750 inhabitants)
89 Km N of Terni (111501 inhabitants)
97 Km SE 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 2021-04-21
21:30:45		 43.3532 12.7685 13 2021-07-12
16:55:12		 Bollettino Sismico Italiano INGV 90451771
Reviewed
Rev100 		ML 1.1 2021-04-21
21:30:45		 43.3513 12.7668 13 2021-04-21
21:42:04		 Sala Sismica INGV-Roma 89338561
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-21 21:30:45 ± 0.05
Latitude 43.3532 ± 0.0018
Longitude 12.7685 ± 0.0025
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90451771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 230
Semi-minor axis of confidence ellipse (meter) 18
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 64
Circular confidence region, given by single value of horizontal uncertainty (meter) 230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 55
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.05846
Epicentral distance of station farthest from the epicenter (degree) 0.39300
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 89338561
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-21 21:42:04

ML:0.9

Field Value
Value 0.9
Uncertainty 0.4
Num. used stations 24
Type of magnitude ML
Reference to an origin 90451771
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-24 14:24:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-04-21T21:31:00.23 0.3 undecidable manual S 144 43.623 93 0.23 67
IV.ASSB.HHZ. 2021-04-21T21:30:57.79 0.6 undecidable manual S 194 35.5422 95 -0.08 47
IV.NARO.HHZ. 2021-04-21T21:30:57.01 0.6 undecidable manual S 332 32.3454 95 0 48
IV.MPAG.EHZ. 2021-04-21T21:30:56.74 0.3 undecidable manual S 359 30.6471 96 0.19 70
IV.MML1.HNE. 2021-04-21T21:30:56.89 0.6 undecidable manual S 148 31.2465 96 0.17 46
IV.PIEI.HHZ. 2021-04-21T21:30:55.56 0.3 undecidable manual S 317 27.6501 97 -0.2 70
IV.EL6.EHZ. 2021-04-21T21:30:55.89 0.3 undecidable manual S 96 27.0507 97 0.3 68
IV.ARVD.HHZ. 2021-04-21T21:30:54.11 0.3 undecidable manual S 41 21.2676 102 0.03 73
IV.ATCC.EHZ. 2021-04-21T21:30:54.19 0.3 undecidable manual S 209 21.3675 102 0.09 72
IV.ATBU.EHZ. 2021-04-21T21:30:54.82 0.3 undecidable manual S 308 22.3554 100 0.45 67
IV.MURB.HHZ. 2021-04-21T21:30:54.47 0.3 undecidable manual S 243 22.0668 101 0.17 71
IV.FRON.EHZ. 2021-04-21T21:30:53.13 0.6 undecidable manual S 349 18.5703 106 -0.25 47
IV.FDMO.HHZ. 2021-04-21T21:30:53.82 0.1 undecidable manual P 144 43.623 93 -0.22 91
IV.MPAG.EHZ. 2021-04-21T21:30:52.05 0.1 undecidable manual P 359 30.6471 96 0 96
IV.ATFO.HHZ. 2021-04-21T21:30:52.74 0.3 undecidable manual S 275 15.9729 111 0.02 74
IV.NARO.HHZ. 2021-04-21T21:30:52.15 0.1 undecidable manual P 332 32.3454 95 -0.16 94
IV.ASSB.HHZ. 2021-04-21T21:30:52.53 0.1 undecidable manual P 194 35.5422 95 -0.28 91
IV.MML1.HNE. 2021-04-21T21:30:51.90 0.1 undecidable manual P 148 31.2465 96 -0.25 93
IV.ATSC.EHE. 2021-04-21T21:30:51.33 0.3 undecidable manual S 320 10.2786 130 -0.08 73
IV.PIEI.HHZ. 2021-04-21T21:30:51.44 0.1 undecidable manual P 317 27.6501 97 -0.15 95
IV.EL6.EHZ. 2021-04-21T21:30:51.54 0.1 undecidable manual P 96 27.0507 97 0.04 96
IV.SSFR.HHZ. 2021-04-21T21:30:51.16 0.3 undecidable manual S 7 9.2796 134 -0.05 74
IV.ATCC.EHZ. 2021-04-21T21:30:50.63 0.1 undecidable manual P 209 21.3675 102 0 98
IV.ATBU.EHZ. 2021-04-21T21:30:50.93 0.1 undecidable manual P 308 22.3554 100 0.14 95
IV.MURB.HHZ. 2021-04-21T21:30:50.82 0.1 undecidable manual P 243 22.0668 101 0.07 96
IV.FRON.EHZ. 2021-04-21T21:30:50.11 0.1 undecidable manual P 349 18.5703 106 -0.11 97
IV.FOSV.EHZ. 2021-04-21T21:30:50.54 0.3 undecidable manual S 185 6.4935 146 -0.19 72
IV.ARVD.HHZ. 2021-04-21T21:30:50.62 0.1 undecidable manual P 41 21.2676 102 -0.01 98
IV.ATFO.HHZ. 2021-04-21T21:30:49.86 0.1 undecidable manual P 275 15.9729 111 0.02 99
IV.ATSC.EHE. 2021-04-21T21:30:49.08 0.1 undecidable manual P 320 10.2786 130 0 100
IV.FOSV.EHZ. 2021-04-21T21:30:48.70 0.6 undecidable manual P 185 6.4935 146 0.01 50
IV.SSFR.HHZ. 2021-04-21T21:30:48.98 1.0 undecidable manual P 7 9.2796 134 0.01 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FOSV.EHN. ML:1.1 0.000156 0.1 AML other m 2021-04-21T21:30:50.64
IV.FOSV.EHE. ML:1.2 0.000203 0.08 AML other m 2021-04-21T21:30:50.61
IV.SSFR.HNN. ML:1.6 0.000481 0.14 AML other m 2021-04-21T21:30:51.63
IV.SSFR.HNE. ML:1.6 0.000426 0.22 AML other m 2021-04-21T21:30:51.72
IV.SSFR.HHE. ML:1.3 0.0002185 0.14 AML other m 2021-04-21T21:30:51.71
IV.SSFR.HHN. ML:1.4 0.000257 0.3 AML other m 2021-04-21T21:30:51.85
IV.ATFO.HHE. ML:0.6 0.0000337 1.7 AML other m 2021-04-21T21:30:52.06
IV.ATFO.HHN. ML:0.6 0.0000322 0.72 AML other m 2021-04-21T21:30:53.00
IV.ATCC.EHN. ML:1.0 0.00006665000000000001 0.22 AML other m 2021-04-21T21:30:54.42
IV.ARVD.HHE. ML:0.7 0.0000367 0.14 AML other m 2021-04-21T21:30:54.25
IV.ATCC.EHE. ML:1.1 0.0000853 0.68 AML other m 2021-04-21T21:30:54.42
IV.ARVD.HHN. ML:0.4 0.00001615 1.22 AML other m 2021-04-21T21:30:54.21
IV.MURB.HHN. ML:1.3 0.000117 0.26 AML other m 2021-04-21T21:30:55.17
IV.MURB.HHE. ML:1.2 0.0001002 1.26 AML other m 2021-04-21T21:30:55.95
IV.PIEI.HHN. ML:0.9 0.00004105 0.12 AML other m 2021-04-21T21:30:55.72
IV.PIEI.HHE. ML:0.9 0.00004075 0.56 AML other m 2021-04-21T21:30:55.57
IV.EL6.EHE. ML:0.9 0.00004165 0.68 AML other m 2021-04-21T21:30:55.65
IV.EL6.EHN. ML:0.7 0.000026139895 0.4096 AML other m 2021-04-21T21:30:56.35
IV.NARO.HHE. ML:0.4 0.000010979638 0.0896 AML other m 2021-04-21T21:30:57.11
IV.NARO.HHN. ML:0.4 0.000009021099500000001 0.064 AML other m 2021-04-21T21:30:58.28
IV.ASSB.HHE. ML:0.4 0.000008152402999999998 0.1408 AML other m 2021-04-21T21:30:58.21
IV.ASSB.HHN. ML:0.1 0.0000072693055 0.2176 AML other m 2021-04-21T21:31:00.68
IV.FDMO.HHE. ML:0.2 0.0000069791265 0.2816 AML other m 2021-04-21T21:31:00.48
IV.FDMO.HHN. ML:0.2 0.000007022255999999999 0.1408 AML other m 2021-04-21T21:31:01.59
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