Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 25-02-2021 and time 01:23:39 (UTC) in region 7 km SE Pietralunga (PG)

A magnitude ML 0.9 earthquake occured in region: 7 km SE Pietralunga (PG), on

  • 25-02-2021 01:23:39 (UTC)
  • 25-02-2021 02:23:39 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.4, 12.5 at 7 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
Pietralunga PG 7 2111 2111
Gubbio PG 8 32216 34327
Cantiano PU 13 2245 36572
Scheggia e Pascelupo PG 13 1393 37965
Montone PG 15 1680 39645
Umbertide PG 18 16681 56326
Costacciaro PG 18 1216 57542
Apecchio PU 19 1882 59424

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km N of Perugia (166134 inhabitants)
51 Km E of Arezzo (99543 inhabitants)
52 Km NW of Foligno (57155 inhabitants)
65 Km SW of Fano (60888 inhabitants)
66 Km SW of Pesaro (94582 inhabitants)
74 Km S of Rimini (147750 inhabitants)
85 Km S of Cesena (96758 inhabitants)
86 Km W of Ancona (100861 inhabitants)
94 Km N of Terni (111501 inhabitants)
95 Km E of Siena (53903 inhabitants)
99 Km SE of Forlì (117913 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 0.9 2021-02-25
01:23:39		 43.4 12.5 7 2021-02-25
01:32:51		 Sala Sismica INGV-Roma 87466091
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-25 01:23:39 ± 0.08
Latitude 43.40 ± 0.00
Longitude 12.50 ± 0.00
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87466091

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 291
Semi-minor axis of confidence ellipse (meter) 187
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 65
Circular confidence region, given by single value of horizontal uncertainty (meter) 290
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 126
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0.06025
Epicentral distance of station farthest from the epicenter (degree) 0.33275
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 87466091
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-25 01:32:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2021-02-25T01:23:46.84 0.6 negative manual P 73 0.3327 100 -0.31 45
IV.PE3.EHZ. 2021-02-25T01:23:46.50 0.6 negative manual P 359 0.2959 101 0.17 46
IV.MPAG.EHZ. 2021-02-25T01:23:46.21 1.0 negative manual P 39 0.295 101 -0.1 24
IV.MURB.HHZ. 2021-02-25T01:23:45.52 0.3 undecidable manual S 174 0.1385 113 0.1 73
IV.ATCC.EHZ. 2021-02-25T01:23:44.99 1.0 positive manual P 155 0.2374 104 -0.07 24
IV.SSFR.HHZ. 2021-02-25T01:23:44.38 0.1 positive manual P 80 0.2059 106 -0.01 97
IV.NARO.HHZ. 2021-02-25T01:23:44.54 0.1 undecidable manual P 15 0.2176 105 -0.1 95
IV.FRON.EHZ. 2021-02-25T01:23:44.30 0.1 positive manual P 54 0.1996 106 0.04 97
IV.BADI.EHZ. 2021-02-25T01:23:44.52 0.6 positive manual P 300 0.2167 105 -0.12 48
IV.APEC.HHZ. 2021-02-25T01:23:43.73 0.3 undecidable manual P 339 0.1691 109 0.12 72
IV.PIEI.HHZ. 2021-02-25T01:23:43.15 0.1 undecidable manual P 10 0.1367 113 0.2 95
IV.ATPI.EHZ. 2021-02-25T01:23:43.63 0.3 undecidable manual S 304 0.089 124 -0.1 73
IV.MURB.HHZ. 2021-02-25T01:23:42.97 0.6 undecidable manual P 174 0.1385 113 0 49
IV.ATFO.HHZ. 2021-02-25T01:23:42.87 0.3 undecidable manual S 124 0.0603 134 0 75
IV.ATFO.HHZ. 2021-02-25T01:23:41.48 0.1 positive manual P 124 0.0603 134 -0.02 100
IV.ATPI.EHZ. 2021-02-25T01:23:41.90 1.0 positive manual P 304 0.089 124 -0.1 24
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATFO.HHE. ML:0 0.000295 0.26 AML other m 2021-02-25T01:23:43.20
IV.ATFO.HHN. ML:0 0.000323 0.26 AML other m 2021-02-25T01:23:43.38
IV.ATPI.EHN. ML:0.9 0.0001165 0.36 AML other m 2021-02-25T01:23:43.88
IV.ATPI.EHE. ML:0.6 6.9E-5 0.44 AML other m 2021-02-25T01:23:44.31
IV.MURB.HHN. ML:1.2 0.0001645 1.14 AML other m 2021-02-25T01:23:46.33
IV.PIEI.HHN. ML:0.9 7.85E-5 0.22 AML other m 2021-02-25T01:23:46.71
IV.MURB.HHE. ML:1.3 0.000198 1.32 AML other m 2021-02-25T01:23:46.73
IV.PIEI.HHE. ML:1.1 0.0001425 0.16 AML other m 2021-02-25T01:23:46.74
IV.APEC.HHE. ML:0.8 4.96E-5 0.3 AML other m 2021-02-25T01:23:47.47
IV.APEC.HHN. ML:0.8 5.925E-5 0.22 AML other m 2021-02-25T01:23:47.65
IV.ATMI.HHN. ML:0.8 4.71E-5 1.18 AML other m 2021-02-25T01:23:47.76
IV.NARO.HHE. ML:0 2.785E-5 0.6 AML other m 2021-02-25T01:23:48.61
IV.BADI.EHE. ML:0 8.16E-5 1.44 AML other m 2021-02-25T01:23:48.75
IV.SSFR.HHN. ML:0 7.705E-5 0.18 AML other m 2021-02-25T01:23:48.84
IV.BADI.EHN. ML:0 9.125E-5 1.6 AML other m 2021-02-25T01:23:48.86
IV.NARO.HHN. ML:0 3.845E-5 1.94 AML other m 2021-02-25T01:23:49.99
IV.FRON.EHN. ML:0 4.11E-5 1.2 AML other m 2021-02-25T01:23:49.18
IV.SSFR.HHE. ML:0 8.645E-5 0.54 AML other m 2021-02-25T01:23:49.16
IV.ATMI.HHE. ML:0 5.98E-5 0.54 AML other m 2021-02-25T01:23:49.57
IV.ATCC.EHN. ML:0 6.005E-5 0.46 AML other m 2021-02-25T01:23:49.59
IV.ATCC.EHE. ML:0 7.725E-5 0.12 AML other m 2021-02-25T01:23:49.74
IV.FRON.EHE. ML:0 2.58E-5 0.44 AML other m 2021-02-25T01:23:50.77
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