Earthquake with magnitude of ML 0.4 on date 28-07-2021 and time 23:54:35 (Italy) in region 1 km E Monte Cavallo (MC)

A magnitude ML 0.4 earthquake occured in region: 1 km E Monte Cavallo (MC), on

  • 28-07-2021 21:54:35 (UTC)
  • 28-07-2021 23:54:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.997, 13.02 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 1 145 145
Pieve Torina MC 6 1458 1603
Fiordimonte MC 7 202 1805
Pievebovigliana MC 9 866 2671
Visso MC 9 1107 3778
Muccia MC 10 915 4693
Serravalle di Chienti MC 10 1070 5763
Ussita MC 11 444 6207
Fiastra MC 12 559 6766
Preci PG 13 724 7490
Acquacanina MC 13 121 7611
Sellano PG 14 1079 8690
Castelsantangelo sul Nera MC 16 281 8971
Camerino MC 16 6974 15945
Bolognola MC 17 142 16087
Sefro MC 18 422 16509

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Foligno (57155 inhabitants)
53 Km E of Perugia (166134 inhabitants)
57 Km NE of Terni (111501 inhabitants)
67 Km NW of Teramo (54892 inhabitants)
78 Km NW of L'Aquila (69753 inhabitants)
80 Km SW of Ancona (100861 inhabitants)
94 Km S of Fano (60888 inhabitants)
99 Km NE of Viterbo (67173 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 2021-07-28
21:54:35
42.9972 13.0195 12 2021-07-28
22:00:12
Sala Sismica INGV-Roma 93321921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-28 21:54:35 ± 0.09
Latitude 42.9972 ± 0.0045
Longitude 13.0195 ± 0.0049
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93321921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 433
Semi-minor axis of confidence ellipse (meter) 425
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 11
Circular confidence region, given by single value of horizontal uncertainty (meter) 430
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 218
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.08
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.16548
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 4
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 93321921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-28 22:00:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HNZ. 2021-07-28T21:54:56.57 3.0 undecidable manual S 0.12 0
IV.MMUR.HNZ. 2021-07-28T21:54:53.92 3.0 undecidable manual S 5.34 0
IV.MURB.HNZ. 2021-07-28T21:54:46.38 3.0 negative manual P -0.18 0
IV.MC2.EHZ. 2021-07-28T21:54:42.04 0.6 undecidable manual S 125 0.1511 97 -0.12 48
IV.CSP1.EHZ. 2021-07-28T21:54:42.59 0.6 undecidable manual S 55 0.1655 95 0 49
IV.MML1.EHZ. 2021-07-28T21:54:41.26 0.6 undecidable manual S 343 0.1214 107 -0.06 49
IV.MC2.EHZ. 2021-07-28T21:54:39.51 1.0 undecidable manual P 125 0.1511 97 0.27 23
IV.FDMO.HHZ. 2021-07-28T21:54:39.87 0.3 undecidable manual S 52 0.063 138 -0.01 75
IV.CSP1.EHZ. 2021-07-28T21:54:39.51 1.0 negative manual P 55 0.1655 95 0.03 24
IV.MML1.EHZ. 2021-07-28T21:54:38.74 1.0 negative manual P 343 0.1214 107 0 25
IV.FDMO.HHZ. 2021-07-28T21:54:37.94 0.1 undecidable manual P 52 0.063 138 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:0.5 3.79E-5 1.84 AML other m 2021-07-28T21:54:40.05
IV.FDMO.HHN. ML:0.4 3.23E-5 0.62 AML other m 2021-07-28T21:54:40.15
IV.MML1.EHN. ML:0.5 2.99E-5 0.12 AML other m 2021-07-28T21:54:41.52
IV.MML1.EHE. ML:0.3 2.225E-5 1.1 AML other m 2021-07-28T21:54:42.59
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