Earthquake with magnitude of ML 0.4 on date 08-08-2021 and time 20:25:15 (Italy) in region 4 km S Monte Cavallo (MC)

A magnitude ML 0.4 earthquake occured in region: 4 km S Monte Cavallo (MC), on

  • 08-08-2021 18:25:15 (UTC)
  • 08-08-2021 20:25:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.96, 13.005 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Monte Cavallo MC 4 145 145
Visso MC 8 1107 1252
Preci PG 9 724 1976
Sellano PG 10 1079 3055
Pieve Torina MC 10 1458 4513
Fiordimonte MC 11 202 4715
Ussita MC 11 444 5159
Pievebovigliana MC 13 866 6025
Serravalle di Chienti MC 13 1070 7095
Muccia MC 14 915 8010
Castelsantangelo sul Nera MC 14 281 8291
Fiastra MC 15 559 8850
Acquacanina MC 16 121 8971
Cerreto di Spoleto PG 17 1075 10046
Bolognola MC 19 142 10188
Norcia PG 20 4957 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Foligno (57155 inhabitants)
53 Km E of Perugia (166134 inhabitants)
53 Km NE of Terni (111501 inhabitants)
66 Km NW of Teramo (54892 inhabitants)
75 Km NW of L'Aquila (69753 inhabitants)
84 Km SW of Ancona (100861 inhabitants)
95 Km NE of Viterbo (67173 inhabitants)
98 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 2021-08-08
18:25:15
42.9605 13.0053 13 2021-08-08
18:35:33
Sala Sismica INGV-Roma 93853041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-08 18:25:15 ± 0.06
Latitude 42.9605 ± 0.0045
Longitude 13.0053 ± 0.0049
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 93853041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 423
Semi-minor axis of confidence ellipse (meter) 277
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 186
Circular confidence region, given by single value of horizontal uncertainty (meter) 420
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
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) 0.03238
Epicentral distance of station farthest from the epicenter (degree) 0.28059
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 93853041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-08 18:35:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2021-08-08T18:25:26.25 0.3 undecidable manual S 288 0.2662 95 0.19 69
IV.CSP1.EHZ. 2021-08-08T18:25:23.91 0.3 undecidable manual S 48 0.1961 99 -0.09 72
IV.MC2.EHZ. 2021-08-08T18:25:22.70 0.3 undecidable manual S 110 0.143 109 0.23 71
IV.MML1.EHZ. 2021-08-08T18:25:22.62 0.3 undecidable manual S 351 0.1547 105 -0.18 72
IV.NRCA.HHZ. 2021-08-08T18:25:22.53 0.3 undecidable manual S 148 0.1502 107 -0.13 71
IV.CESI.HNZ. 2021-08-08T18:25:21.15 0.3 undecidable manual S 301 0.0863 131 0.15 72
IV.ASSB.HHZ. 2021-08-08T18:25:21.66 0.3 undecidable manual P 288 0.2662 95 -0.03 72
IV.GAVE.HNN. 2021-08-08T18:25:21.60 0.3 undecidable manual P 197 0.2806 94 -0.32 67
IV.FEMA.HNZ. 2021-08-08T18:25:20.19 0.3 undecidable manual S 87 0.0324 159 0.1 74
IV.FDMO.HHZ. 2021-08-08T18:25:20.96 0.3 undecidable manual S 38 0.0971 126 -0.28 71
IV.CSP1.EHZ. 2021-08-08T18:25:20.46 0.3 undecidable manual P 48 0.1961 99 -0.03 73
IV.NRCA.HHZ. 2021-08-08T18:25:19.72 0.3 undecidable manual P 148 0.1502 107 0 73
IT.MTCL.HGZ. 2021-08-08T18:25:19.90 0.3 undecidable manual S 353 0.0333 159 -0.2 73
IV.MC2.EHZ. 2021-08-08T18:25:19.87 0.3 undecidable manual P 110 0.143 109 0.26 70
IV.MML1.EHZ. 2021-08-08T18:25:19.71 0.3 undecidable manual P 351 0.1547 105 -0.09 73
IV.CESI.HNZ. 2021-08-08T18:25:18.96 0.3 undecidable manual P 301 0.0863 131 0.2 71
IV.FEMA.HNZ. 2021-08-08T18:25:18.38 0.3 undecidable manual P 87 0.0324 159 0.15 73
IV.FDMO.HHZ. 2021-08-08T18:25:18.90 0.1 undecidable manual P 38 0.0971 126 0 99
IT.MTCL.HGZ. 2021-08-08T18:25:18.25 0.1 undecidable manual P 353 0.0333 159 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:0.8 6.995E-5 0.58 AML other m 2021-08-08T18:25:21.13
IV.FDMO.HHE. ML:0.8 6.535E-5 0.1 AML other m 2021-08-08T18:25:21.08
IV.MML1.EHE. ML:0.3 1.565938E-5 0.1024 AML other m 2021-08-08T18:25:23.23
IV.MML1.EHN. ML:0.4 2.021566E-5 0.2048 AML other m 2021-08-08T18:25:22.82
IV.NRCA.HHE. ML:0.3 1.72117715E-5 0.0896 AML other m 2021-08-08T18:25:24.04
IV.NRCA.HHN. ML:0.3 1.4395415E-5 0 AML other m 2021-08-08T18:25:23.03
IV.ASSB.HHE. ML:0.3 1.0121172E-5 0.128 AML other m 2021-08-08T18:25:26.30
IV.ASSB.HHN. ML:0.3 1.11277695E-5 0.1536 AML other m 2021-08-08T18:25:26.37
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