Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 0.8 on date 25-02-2021 and time 08:03:39 (UTC) in region 4 km NW Gubbio (PG)

A magnitude ML 0.8 (quarry blast) earthquake occured in region: 4 km NW Gubbio (PG), on

  • 25-02-2021 08:03:39 (UTC)
  • 25-02-2021 09:03:39 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3860, 12.5620 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: quarry blast.

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 4 32216 32216
Scheggia e Pascelupo PG 9 1393 33609
Cantiano PU 11 2245 35854
Pietralunga PG 12 2111 37965
Costacciaro PG 13 1216 39181
Sigillo PG 16 2404 41585
Fossato di Vico PG 19 2840 44425
Montone PG 19 1680 46105
Cagli PU 19 8731 54836

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km NE of Perugia (166134 inhabitants)
49 Km N of Foligno (57155 inhabitants)
56 Km E of Arezzo (99543 inhabitants)
63 Km SW of Fano (60888 inhabitants)
65 Km SW of Pesaro (94582 inhabitants)
75 Km S of Rimini (147750 inhabitants)
81 Km W of Ancona (100861 inhabitants)
87 Km SE of Cesena (96758 inhabitants)
92 Km N of Terni (111501 inhabitants)
100 Km E of Siena (53903 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 0.8 2021-02-25
08:03:39		 43.3862 12.5625 1 2021-07-12
16:55:12		 Bollettino Sismico Italiano INGV 90447241
Reviewed
Rev100 		ML 1.0 2021-02-25
08:03:38		 43.3432 12.594 10 2021-02-25
08:13:53		 Sala Sismica INGV-Roma 87474651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-25 08:03:39 ± 0.06
Latitude 43.3862 ± 0.0036
Longitude 12.5625 ± 0.0049
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type quarry blast
Origin ID 90447241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 400
Semi-minor axis of confidence ellipse (meter) 350
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 337
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 90
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.02068
Epicentral distance of station farthest from the epicenter (degree) 0.26170
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 90447241
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-24 10:45:15

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 87474651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-25 08:13:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BADI.EHZ. 2021-02-25T08:03:45.38 0.3 undecidable manual P 298 29.0487 91 -0.24 69
IV.FRON.EHZ. 2021-02-25T08:03:43.51 0.1 undecidable manual P 42 19.6692 91 -0.22 94
IV.PIEI.HHZ. 2021-02-25T08:03:43.10 0.3 undecidable manual P 352 16.7721 92 -0.05 74
IV.SSFR.HHZ. 2021-02-25T08:03:43.51 0.3 undecidable manual P 72 18.5703 92 0 74
IV.ATBU.EHZ. 2021-02-25T08:03:42.06 0.1 undecidable manual P 353 9.9789 93 0.26 95
IV.ATLO.HNZ. 2021-02-25T08:03:42.71 0.3 undecidable manual P 238 14.7741 92 -0.05 74
IV.TB03.DHZ. 2021-02-25T08:03:42.23 0.3 undecidable manual P 278 12.3765 92 -0.05 74
IV.ATVO.HHZ. 2021-02-25T08:03:42.26 0.3 undecidable manual P 268 12.5763 92 -0.05 74
IV.ATPI.EHZ. 2021-02-25T08:03:42.65 0.3 undecidable manual P 299 14.7741 92 -0.1 73
IV.MURB.HHZ. 2021-02-25T08:03:42.67 0.3 undecidable manual P 193 13.9749 92 0.07 74
IV.ATSC.EHZ. 2021-02-25T08:03:42.16 0.3 undecidable manual P 67 10.878 93 0.19 72
IV.ATPC.HNZ. 2021-02-25T08:03:42.46 0.3 undecidable manual P 321 13.4754 92 -0.04 74
IV.TB01.DHZ. 2021-02-25T08:03:42.22 0.3 undecidable manual P 267 10.2786 93 0.37 70
IV.ATFO.HHZ. 2021-02-25T08:03:40.18 0.1 positive manual P 162 2.2977 102 -0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MURB.HHN. ML:1.0 0.000125 0.3 AML other m 2021-02-25T08:03:46.40
IV.ATVO.HHN. ML:0.7 0.00007505000000000001 0.6 AML other m 2021-02-25T08:03:46.85
IV.MURB.HHE. ML:0.8 0.0000833 0.88 AML other m 2021-02-25T08:03:48.82
IV.ATVO.HHE. ML:0.8 0.00009455 1.28 AML other m 2021-02-25T08:03:49.24
IV.PIEI.HHN. ML:0.7 0.000054499999999999997 1.14 AML other m 2021-02-25T08:03:50.39
IV.ATPI.EHN. ML:0.8 0.00008465 1.08 AML other m 2021-02-25T08:03:50.29
IV.PIEI.HHE. ML:0.9 0.0000785 1.26 AML other m 2021-02-25T08:03:50.85
IV.ATPI.EHE. ML:0.9 0.0000993 1.1 AML other m 2021-02-25T08:03:51.38
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