Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 0.8 on date 18-02-2021 and time 07:18:00 (Italy) in region 2 km N Trevi (PG)

A magnitude ML 0.8 (quarry blast) earthquake occured in region: 2 km N Trevi (PG), on

  • 18-02-2021 06:18:00 (UTC)
  • 18-02-2021 07:18:00 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8920, 12.7460 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
Trevi PG 2 8469 8469
Montefalco PG 8 5679 14148
Foligno PG 8 57155 71303
Campello sul Clitunno PG 8 2442 73745
Castel Ritaldi PG 10 3278 77023
Bevagna PG 12 5081 82104
Spello PG 13 8645 90749
Sellano PG 15 1079 91828
Giano dell'Umbria PG 15 3846 95674
Gualdo Cattaneo PG 16 6155 101829
Cerreto di Spoleto PG 16 1075 102904
Vallo di Nera PG 17 364 103268
Spoleto PG 17 38218 141486
Cannara PG 18 4305 145791
Valtopina PG 19 1398 147189
Sant'Anatolia di Narco PG 19 564 147753

Municipalities with at least 50000 inhabitants

An earthquake occurred to
8 Km SE of Foligno (57155 inhabitants)
38 Km N of Terni (111501 inhabitants)
38 Km SE of Perugia (166134 inhabitants)
74 Km NE of Viterbo (67173 inhabitants)
80 Km NW of L'Aquila (69753 inhabitants)
82 Km W of Teramo (54892 inhabitants)
95 Km SE of Arezzo (99543 inhabitants)
99 Km N of Guidonia Montecelio (88673 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 2021-02-18
06:18:00		 42.892 12.7465 1 2021-07-12
16:55:03		 Bollettino Sismico Italiano INGV 88374761
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-18 06:18:00 ± 0.17
Latitude 42.8920 ± 0.0099
Longitude 12.7465 ± 0.0135
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 88374761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1140
Semi-minor axis of confidence ellipse (meter) 1060
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 298
Circular confidence region, given by single value of horizontal uncertainty (meter) 1140.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 101
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.15648
Epicentral distance of station farthest from the epicenter (degree) 0.39031
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 88374761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-18 15:32:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-02-18T06:18:09.76 0.3 undecidable manual P 59 43.3233 91 0.46 67
IV.LNSS.HNZ. 2021-02-18T06:18:08.22 0.3 undecidable manual P 143 40.0266 91 -0.42 68
IV.GAVE.EHZ. 2021-02-18T06:18:06.31 0.6 undecidable manual P 151 25.2525 91 0.63 43
IV.NRCA.HHZ. 2021-02-18T06:18:06.41 0.3 undecidable manual P 102 30.5472 91 -0.34 70
IV.FDMO.HHZ. 2021-02-18T06:18:06.92 0.3 undecidable manual P 60 31.9458 91 -0.11 73
IV.MOMA.HHZ. 2021-02-18T06:18:04.24 0.3 undecidable manual P 236 17.3715 92 0.14 75
IV.ASSB.HHZ. 2021-02-18T06:18:04.06 0.1 positive manual P 337 18.1707 92 -0.2 98
IV.CESI.HHZ. 2021-02-18T06:18:04.34 0.1 positive manual P 46 17.9709 92 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASSB.HHN. ML:0.9 0.00008235000000000001 0.22 AML other m 2021-02-18T06:18:07.24
IV.CESI.HHN. ML:0.6 0.0000368 1.32 AML other m 2021-02-18T06:18:08.03
IV.ASSB.HHE. ML:1.0 0.00008555 0.4 AML other m 2021-02-18T06:18:08.08
IV.CESI.HHE. ML:0.6 0.0000335 0.88 AML other m 2021-02-18T06:18:11.29
IV.FDMO.HHN. ML:0.6 0.000019200000000000003 0.28 AML other m 2021-02-18T06:18:11.80
IV.FDMO.HHE. ML:0.5 0.0000168 0.42 AML other m 2021-02-18T06:18:13.48
IV.GAVE.EHE. ML:1.0 0.00007035 0.52 AML other m 2021-02-18T06:18:16.58
IV.GAVE.EHN. ML:1.0 0.00006905 0.08 AML other m 2021-02-18T06:18:18.62
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