Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 06-02-2021 and time 22:45:16 (UTC) in region 3 km S Bolognola (MC)

A magnitude ML 0.5 earthquake occured in region: 3 km S Bolognola (MC), on

  • 06-02-2021 22:45:16 (UTC)
  • 06-02-2021 23:45:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.97, 13.22 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Bolognola MC 3 142 142
Ussita MC 7 444 586
Acquacanina MC 8 121 707
Fiastra MC 9 559 1266
Sarnano MC 10 3264 4530
Montefortino FM 10 1178 5708
Castelsantangelo sul Nera MC 10 281 5989
Amandola FM 11 3629 9618
Montemonaco AP 12 604 10222
Visso MC 12 1107 11329
Fiordimonte MC 13 202 11531
Gualdo MC 14 815 12346
Pievebovigliana MC 15 866 13212
Comunanza AP 16 3166 16378
Cessapalombo MC 16 512 16890
Pieve Torina MC 16 1458 18348
Montegallo AP 17 523 18871
San Ginesio MC 17 3498 22369
Preci PG 18 724 23093
Monte Cavallo MC 18 145 23238
Camporotondo di Fiastrone MC 18 563 23801
Smerillo FM 19 365 24166
Caldarola MC 19 1823 25989
Monte San Martino MC 19 765 26754
Penna San Giovanni MC 19 1108 27862
Muccia MC 19 915 28777
Montefalcone Appennino FM 19 424 29201

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km E of Foligno (57155 inhabitants)
52 Km NW of Teramo (54892 inhabitants)
65 Km NE of Terni (111501 inhabitants)
70 Km E of Perugia (166134 inhabitants)
70 Km N of L'Aquila (69753 inhabitants)
76 Km SW of Ancona (100861 inhabitants)
91 Km NW of Montesilvano (53738 inhabitants)
99 Km NW of Pescara (121014 inhabitants)
99 Km S of Fano (60888 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 0.5 2021-02-06
22:45:16		 42.97 13.22 7 2021-02-06
23:06:08		 Sala Sismica INGV-Roma 86893001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-06 22:45:16 ± 0.15
Latitude 42.97 ± 0.00
Longitude 13.22 ± 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 86893001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 340
Semi-minor axis of confidence ellipse (meter) 114
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 66
Circular confidence region, given by single value of horizontal uncertainty (meter) 340
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 18
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
Epicentral distance of station farthest from the epicenter (degree) 0.23562
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 86893001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-06 23:06:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ARCI.HHZ. 2021-02-06T22:45:33.55 3.0 undecidable manual Pn -0.05 0
IV.CPGN.EHZ. 2021-02-06T22:45:31.62 3.0 negative manual P 0.07 0
IV.CESI.HNZ. 2021-02-06T22:45:26.38 0.6 undecidable manual S 279 0.2356 105 0.13 63
IV.MML1.HNZ. 2021-02-06T22:45:26.16 0.3 undecidable manual S 308 0.2329 106 0 97
IV.NRCA.HNZ. 2021-02-06T22:45:23.71 0.3 undecidable manual S 210 0.1583 112 0.28 93
IV.CESI.HNZ. 2021-02-06T22:45:22.36 0.6 undecidable manual P 279 0.2356 105 0.09 64
IV.GUMA.HNZ. 2021-02-06T22:45:22.69 0.6 undecidable manual S 41 0.1232 118 0.48 60
IV.FDMO.HHZ. 2021-02-06T22:45:22.08 0.3 undecidable manual S 304 0.1196 119 0 99
IV.CSP1.EHZ. 2021-02-06T22:45:22.10 0.3 undecidable manual S 354 0.1223 118 -0.07 98
IV.MML1.HNZ. 2021-02-06T22:45:21.99 0.6 undecidable manual P 308 0.2329 106 -0.23 62
IV.MF5.EHZ. 2021-02-06T22:45:21.40 0.6 undecidable manual P 84 0.1736 111 0.44 60
IV.MMO1.EHZ. 2021-02-06T22:45:21.26 0.3 undecidable manual S 133 0.1034 122 -0.29 94
IV.NRCA.HNZ. 2021-02-06T22:45:20.62 0.6 undecidable manual P 210 0.1583 112 -0.03 65
IV.MC2.EHZ. 2021-02-06T22:45:20.39 0.3 undecidable manual S 203 0.0639 135 0.04 100
IV.GUMA.HNZ. 2021-02-06T22:45:20.05 0.3 undecidable manual P 41 0.1232 118 0.11 97
IV.PF6.EHZ. 2021-02-06T22:45:20.69 0.6 undecidable manual P 353 0.1691 111 -0.17 63
IV.MMO1.EHZ. 2021-02-06T22:45:19.37 0.3 negative manual P 133 0.1034 122 -0.19 96
IV.CSP1.EHZ. 2021-02-06T22:45:19.74 0.3 undecidable manual P 354 0.1223 118 -0.17 96
IV.FDMO.HHZ. 2021-02-06T22:45:19.82 0.3 undecidable manual P 304 0.1196 119 -0.04 99
IV.MC2.EHZ. 2021-02-06T22:45:18.82 0.3 negative manual P 203 0.0639 135 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:0.3 2.512245E-5 0.256 AML other m 2021-02-06T22:45:22.96
IV.FDMO.HHE. ML:0.2 1.82427E-5 0.2176 AML other m 2021-02-06T22:45:22.50
IV.CPGN.EHN. ML:2 7.55489E-5 0.192 AML other m 2021-02-06T22:46:08.29
IV.CPGN.EHE. ML:1.8 5.10697E-5 0.1792 AML other m 2021-02-06T22:46:00.44
IV.CSP1.EHE. ML:0.7 5.70775495E-5 1.3696 AML other m 2021-02-06T22:45:22.64
IV.CSP1.EHN. ML:0.9 8.4142775E-5 2.7392 AML other m 2021-02-06T22:45:24.09
IV.CPGN.HNE. ML:2.1 9.45120245E-5 0.3328 AML other m 2021-02-06T22:46:09.64
IV.CPGN.HNN. ML:2.4 0.00020136395 0.6656 AML other m 2021-02-06T22:45:53.04
IV.ARCI.HHE. ML:1.9 4.4554375E-5 1.0624 AML other m 2021-02-06T22:45:43.96
IV.ARCI.HHN. ML:1.6 2.4937985E-5 0.8704 AML other m 2021-02-06T22:45:44.82
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