Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 1.2 on date 26-04-2023 and time 07:02:12 (UTC) in region 2 km NE Trevi (PG)

A magnitude ML 1.2 (quarry blast) earthquake occured in region: 2 km NE Trevi (PG), on

  • 26-04-2023 07:02:12 (UTC)
  • 26-04-2023 09:02:12 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8910, 12.7730 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
Campello sul Clitunno PG 8 2442 10911
Foligno PG 9 57155 68066
Montefalco PG 10 5679 73745
Castel Ritaldi PG 11 3278 77023
Sellano PG 13 1079 78102
Spello PG 14 8645 86747
Cerreto di Spoleto PG 14 1075 87822
Bevagna PG 14 5081 92903
Vallo di Nera PG 15 364 93267
Giano dell'Umbria PG 17 3846 97113
Spoleto PG 18 38218 135331
Gualdo Cattaneo PG 18 6155 141486
Sant'Anatolia di Narco PG 18 564 142050
Valtopina PG 19 1398 143448
Cannara PG 19 4305 147753

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km SE of Foligno (57155 inhabitants)
38 Km N of Terni (111501 inhabitants)
40 Km SE of Perugia (166134 inhabitants)
76 Km NE of Viterbo (67173 inhabitants)
79 Km NW of L'Aquila (69753 inhabitants)
80 Km W of Teramo (54892 inhabitants)
97 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 1.2 2023-04-26
07:02:12		 42.8907 12.7732 1 2024-03-01
17:18:20		 Bollettino Sismico Italiano INGV 124990851
Reviewed
Rev100 		ML 1.2 2023-04-26
07:02:12		 42.8933 12.7622 9 2023-04-26
07:27:43		 Sala Sismica INGV-Roma 116761711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-26 07:02:12 ± 0.11
Latitude 42.8907 ± 0.0072
Longitude 12.7732 ± 0.0098
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 124990851

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 810
Semi-minor axis of confidence ellipse (meter) 710
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 320
Circular confidence region, given by single value of horizontal uncertainty (meter) 810.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
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) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.14929
Epicentral distance of station farthest from the epicenter (degree) 0.37412
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 124990851
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-02-02 13:57:18

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 116761711
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-26 07:27:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2023-04-26T07:02:20.16 0.3 undecidable manual P 57 41.5251 91 -0.3 92
IV.LNSS.HHZ. 2023-04-26T07:02:19.71 0.3 undecidable manual P 146 38.628 91 -0.17 95
IV.FDMO.HHZ. 2023-04-26T07:02:18.24 0.3 undecidable manual P 58 30.2475 91 0.05 99
IV.NRCA.HHZ. 2023-04-26T07:02:18.00 0.3 undecidable manual P 103 28.4493 91 0.16 97
IV.MML1.EHE. 2023-04-26T07:02:17.90 0.3 undecidable manual P 33 29.5482 91 -0.15 97
IV.MOMA.HHZ. 2023-04-26T07:02:16.08 0.3 undecidable manual P 240 19.1697 91 0.11 100
IV.ASSB.HHZ. 2023-04-26T07:02:15.88 0.3 undecidable manual P 331 19.2696 91 -0.12 100
IV.CESI.HHZ. 2023-04-26T07:02:15.88 0.3 undecidable manual P 40 16.5723 92 0.42 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASSB.HHE. ML:1.3 0.00019250000000000002 0.38 AML other m 2023-04-26T07:02:20.60
IV.CESI.HHE. ML:1.1 0.00012054999999999999 0.34 AML other m 2023-04-26T07:02:21.38
IV.ASSB.HHN. ML:1.4 0.000203 0.38 AML other m 2023-04-26T07:02:21.84
IV.MOMA.HHE. ML:1.2 0.00014500000000000003 0.34 AML other m 2023-04-26T07:02:23.07
IV.CESI.HHN. ML:1.3 0.00020649999999999998 0.34 AML other m 2023-04-26T07:02:23.23
IV.NRCA.HHN. ML:1.0 0.00006235 0.36 AML other m 2023-04-26T07:02:24.34
IV.MOMA.HHN. ML:0.9 0.00006819999999999999 0.4 AML other m 2023-04-26T07:02:24.22
IV.NRCA.HHE. ML:1.0 0.00005475 0.36 AML other m 2023-04-26T07:02:24.59
IV.FDMO.HHN. ML:1.3 0.00009685000000000001 0.34 AML other m 2023-04-26T07:02:24.60
IV.FDMO.HHE. ML:1.2 0.00008149999999999999 0.4 AML other m 2023-04-26T07:02:24.60
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