Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 25-02-2021 and time 22:00:12 (Italy) in region 3 km N Preci (PG)

A magnitude ML 1.3 earthquake occured in region: 3 km N Preci (PG), on

  • 25-02-2021 21:00:12 (UTC)
  • 25-02-2021 22:00:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.91, 13.03 at 12 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Preci PG 3 724 724
Visso MC 5 1107 1831
Sellano PG 9 1079 2910
Ussita MC 10 444 3354
Monte Cavallo MC 10 145 3499
Castelsantangelo sul Nera MC 10 281 3780
Cerreto di Spoleto PG 14 1075 4855
Norcia PG 14 4957 9812
Fiordimonte MC 15 202 10014
Pieve Torina MC 15 1458 11472
Fiastra MC 17 559 12031
Pievebovigliana MC 18 866 12897
Acquacanina MC 18 121 13018
Bolognola MC 19 142 13160
Serravalle di Chienti MC 19 1070 14230
Muccia MC 19 915 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km E of Foligno (57155 inhabitants)
50 Km NE of Terni (111501 inhabitants)
57 Km E of Perugia (166134 inhabitants)
62 Km W of Teramo (54892 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
88 Km SW of Ancona (100861 inhabitants)
93 Km NE of Viterbo (67173 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.3 2021-02-25
21:00:12		 42.91 13.03 13 2021-02-25
21:06:32		 Sala Sismica INGV-Roma 87485271
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-25 21:00:12 ± 0.1
Latitude 42.91 ± 0.00
Longitude 13.03 ± 0.01
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87485271

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 606
Semi-minor axis of confidence ellipse (meter) 239
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 316
Circular confidence region, given by single value of horizontal uncertainty (meter) 610
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 189
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
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) 0.09623
Epicentral distance of station farthest from the epicenter (degree) 0.23922
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0
Num. used stations 3
Type of magnitude ML
Reference to an origin 87485271
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-25 21:06:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MMO1.EHZ. 2021-02-25T21:00:21.07 0.3 undecidable manual S 93 0.2158 98 -0.04 72
IV.CSP1.EHZ. 2021-02-25T21:00:21.27 0.6 undecidable manual S 34 0.2212 97 -0.01 49
IV.GAVE.EHZ. 2021-02-25T21:00:21.79 0.3 undecidable manual S 205 0.2392 96 -0.03 73
IV.MC2.EHZ. 2021-02-25T21:00:18.52 0.6 undecidable manual S 89 0.1142 119 0.29 47
IV.NRCA.HHZ. 2021-02-25T21:00:17.44 0.6 undecidable manual S 142 0.0962 126 -0.35 46
IV.CSP1.EHZ. 2021-02-25T21:00:17.28 0.3 undecidable manual P 34 0.2212 97 -0.18 71
IV.GAVE.EHZ. 2021-02-25T21:00:17.83 0.1 undecidable manual P 205 0.2392 96 0.06 96
IV.MMO1.EHZ. 2021-02-25T21:00:17.36 0.1 undecidable manual P 93 0.2158 98 0 98
IV.MC2.EHZ. 2021-02-25T21:00:15.91 0.3 undecidable manual P 89 0.1142 119 0.2 72
IV.NRCA.HHZ. 2021-02-25T21:00:15.46 0.1 negative manual P 142 0.0962 126 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.3 0.0002305 0.14 AML other m 2021-02-25T21:00:17.59
IV.NRCA.HHE. ML:1.3 0.0002085 1.22 AML other m 2021-02-25T21:00:18.06
IV.NRCA.HNE. ML:1.3 0.00020216025 0.7168 AML other m 2021-02-25T21:00:18.11
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download