Earthquake with magnitude of ML 0.4 on date 25-07-2021 and time 02:35:17 (Italy) in region 11 km SE Valtopina (PG)

A magnitude ML 0.4 earthquake occured in region: 11 km SE Valtopina (PG), on

  • 25-07-2021 00:35:17 (UTC)
  • 25-07-2021 02:35:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.994, 12.85 at 10 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Valtopina PG 11 1398 1398
Serravalle di Chienti MC 12 1070 2468
Monte Cavallo MC 12 145 2613
Foligno PG 13 57155 59768
Sellano PG 13 1079 60847
Nocera Umbra PG 14 5839 66686
Spello PG 15 8645 75331
Trevi PG 15 8469 83800
Pieve Torina MC 17 1458 85258
Muccia MC 19 915 86173
Sefro MC 19 422 86595
Montefalco PG 19 5679 92274
Cerreto di Spoleto PG 20 1075 93349
Preci PG 20 724 94073

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km E of Foligno (57155 inhabitants)
40 Km E of Perugia (166134 inhabitants)
51 Km NE of Terni (111501 inhabitants)
79 Km W of Teramo (54892 inhabitants)
84 Km NW of L'Aquila (69753 inhabitants)
88 Km SW of Ancona (100861 inhabitants)
88 Km NE of Viterbo (67173 inhabitants)
94 Km SE of Arezzo (99543 inhabitants)
96 Km S of Fano (60888 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 0.4 2021-07-25
00:35:17
42.9938 12.8505 10 2021-07-25
00:47:22
Sala Sismica INGV-Roma 93174411
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-25 00:35:17 ± 0.12
Latitude 42.9938 ± 0.0099
Longitude 12.8505 ± 0.0049
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93174411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1079
Semi-minor axis of confidence ellipse (meter) 180
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 183
Circular confidence region, given by single value of horizontal uncertainty (meter) 1080
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 199
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.04137
Epicentral distance of station farthest from the epicenter (degree) 0.27699
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 93174411
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-25 00:47:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-07-25T00:35:28.73 0.6 undecidable manual S 69 0.277 50 0.26 47
IV.FDMO.HHZ. 2021-07-25T00:35:25.03 0.6 undecidable manual S 76 0.1781 116 -0.18 49
IV.ASSB.HHZ. 2021-07-25T00:35:24.16 0.6 undecidable manual S 289 0.1484 121 -0.04 51
IV.MML1.EHZ. 2021-07-25T00:35:24.12 0.6 undecidable manual S 36 0.1484 121 -0.09 50
IT.MTCL.HGE. 2021-07-25T00:35:23.07 0.6 undecidable manual S 90 0.1088 129 0.12 50
IV.CSP1.EHZ. 2021-07-25T00:35:23.88 1.0 negative manual P 69 0.277 50 0.03 25
IV.ATCC.HNE. 2021-07-25T00:35:23.20 0.1 undecidable manual P 321 0.2455 50 -0.12 98
IV.FDMO.HHZ. 2021-07-25T00:35:22.05 0.6 positive manual P 76 0.1781 116 0.08 50
IV.MML1.EHZ. 2021-07-25T00:35:21.52 0.6 positive manual P 36 0.1484 121 0.13 50
IV.CESI.HHZ. 2021-07-25T00:35:21.39 0.6 undecidable manual S 74 0.0414 155 0.08 51
IV.ASSB.HHZ. 2021-07-25T00:35:21.48 0.3 positive manual P 289 0.1484 121 0.09 76
IT.MTCL.HGE. 2021-07-25T00:35:20.28 0.1 undecidable manual P 90 0.1088 129 -0.38 95
IV.CESI.HHZ. 2021-07-25T00:35:19.94 0.1 undecidable manual P 74 0.0414 155 0.22 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:0.4 4.27E-5 0.36 AML other m 2021-07-25T00:35:21.54
IV.CESI.HHE. ML:0.5 5.04E-5 0.28 AML other m 2021-07-25T00:35:21.45
IV.ASSB.HHE. ML:0.7 3.775E-5 0.18 AML other m 2021-07-25T00:35:24.33
IV.ASSB.HHN. ML:0.7 4.25E-5 0.32 AML other m 2021-07-25T00:35:24.35
IV.MML1.EHE. ML:0 8.082819E-6 0.08 AML other m 2021-07-25T00:35:24.36
IV.MML1.EHN. ML:0 9.995385E-6 0.12 AML other m 2021-07-25T00:35:24.56
IV.FDMO.HHE. ML:-0.2 7.2431575E-6 0.1 AML other m 2021-07-25T00:35:25.57
IV.FDMO.HHN. ML:0.1 9.29896E-6 0.12 AML other m 2021-07-25T00:35:26.06
IV.CSP1.EHE. ML:0.7 2.284314E-5 0.6 AML other m 2021-07-25T00:35:28.95
IV.CSP1.EHN. ML:0.7 2.2602755E-5 0.96 AML other m 2021-07-25T00:35:29.28
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