Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 06-12-2021 and time 09:52:30 (UTC) in region 5 km S Bolognola (MC)

A magnitude ML 1.7 earthquake occured in region: 5 km S Bolognola (MC), on

  • 06-12-2021 09:52:30 (UTC)
  • 06-12-2021 10:52:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9520, 13.2400 at 18 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Bolognola MC 5 142 142
Ussita MC 8 444 586
Montefortino FM 8 1178 1764
Montemonaco AP 9 604 2368
Castelsantangelo sul Nera MC 9 281 2649
Amandola FM 10 3629 6278
Acquacanina MC 10 121 6399
Sarnano MC 11 3264 9663
Fiastra MC 12 559 10222
Visso MC 12 1107 11329
Montegallo AP 14 523 11852
Comunanza AP 14 3166 15018
Gualdo MC 15 815 15833
Fiordimonte MC 16 202 16035
Pievebovigliana MC 18 866 16901
Cessapalombo MC 18 512 17413
Smerillo FM 18 365 17778
Preci PG 18 724 18502
Montefalcone Appennino FM 18 424 18926
Pieve Torina MC 19 1458 20384
Monte San Martino MC 19 765 21149
San Ginesio MC 19 3498 24647
Palmiano AP 19 196 24843
Penna San Giovanni MC 19 1108 25951
Monte Cavallo MC 20 145 26096

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Foligno (57155 inhabitants)
50 Km NW of Teramo (54892 inhabitants)
65 Km NE of Terni (111501 inhabitants)
68 Km N of L'Aquila (69753 inhabitants)
71 Km E of Perugia (166134 inhabitants)
78 Km SW of Ancona (100861 inhabitants)
89 Km NW of Montesilvano (53738 inhabitants)
96 Km NW of Pescara (121014 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.7 2021-12-06
09:52:30		 42.9517 13.2395 18 2022-03-30
13:04:24		 Bollettino Sismico Italiano INGV 99051641
Reviewed
Rev100 		ML 1.7 2021-12-06
09:52:30		 42.9507 13.2463 18 2021-12-06
09:56:19		 Sala Sismica INGV-Roma 98207211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-06 09:52:30 ± 0.13
Latitude 42.9517 ± 0.0036
Longitude 13.2395 ± 0.0074
Depth (km) 18 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99051641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 546
Semi-minor axis of confidence ellipse (meter) 185
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 270
Circular confidence region, given by single value of horizontal uncertainty (meter) 550.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 87
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.50902
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 99051641
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-27 10:24:27

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 98207211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-06 09:56:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2021-12-06T09:52:50.54 3.0 undecidable manual S -0.47 0
IV.LNSS.HNZ. 2021-12-06T09:52:44.80 0.3 undecidable manual S 203 41.9247 102 0.56 64
IV.EL6.EHZ. 2021-12-06T09:52:44.84 0.3 undecidable manual S 345 43.3233 102 0.23 69
IV.SMA1.EHZ. 2021-12-06T09:52:42.45 0.6 undecidable manual S 168 36.4413 105 -0.37 45
IV.CESI.HHZ. 2021-12-06T09:52:40.89 0.3 undecidable manual S 282 27.8499 111 0.27 70
IV.MTRA.EHZ. 2021-12-06T09:52:39.77 0.6 undecidable manual S 149 25.1526 114 -0.18 48
IV.ARRO.EHZ. 2021-12-06T09:52:39.90 0.3 undecidable manual P 223 56.499 98 -0.71 58
IV.MF5.EHZ. 2021-12-06T09:52:38.66 0.3 undecidable manual S 77 18.3705 124 0.29 71
IV.EL6.EHZ. 2021-12-06T09:52:38.75 0.3 undecidable manual P 345 43.3233 102 0.15 71
IV.LNSS.HNZ. 2021-12-06T09:52:38.47 0.1 undecidable manual P 203 41.9247 102 0.08 96
IV.NRCA.HHZ. 2021-12-06T09:52:38.03 0.3 undecidable manual S 218 16.5723 128 0.04 75
IV.SNTG.HHE. 2021-12-06T09:52:38.31 0.3 undecidable manual P 324 41.4252 102 -0.01 72
IV.MNTT.EHZ. 2021-12-06T09:52:37.42 3.0 positive manual P 0.26 0
IV.CSP1.EHZ. 2021-12-06T09:52:37.50 0.6 undecidable manual S 350 15.7731 130 -0.33 47
IV.SMA1.EHZ. 2021-12-06T09:52:37.47 0.3 undecidable manual P 168 36.4413 105 -0.1 71
IV.FDMO.HHZ. 2021-12-06T09:52:37.36 0.3 undecidable manual S 307 15.5733 130 -0.41 70
IV.MC2.EHZ. 2021-12-06T09:52:36.36 0.3 undecidable manual S 223 6.0939 157 0.1 75
IV.CESI.HHZ. 2021-12-06T09:52:36.41 0.3 undecidable manual P 282 27.8499 111 0.11 73
IT.MTCL.HGZ. 2021-12-06T09:52:35.18 0.3 undecidable manual P 284 20.0688 121 -0.04 74
IV.MF5.EHZ. 2021-12-06T09:52:35.19 0.1 positive manual P 77 18.3705 124 0.19 97
IV.MTRA.EHZ. 2021-12-06T09:52:35.76 0.1 undecidable manual P 149 25.1526 114 -0.15 96
IV.CSP1.EHZ. 2021-12-06T09:52:34.51 0.1 negative manual P 350 15.7731 130 -0.18 97
IV.NRCA.HHZ. 2021-12-06T09:52:34.84 0.1 positive manual P 218 16.5723 128 0.05 100
IV.FDMO.HHZ. 2021-12-06T09:52:34.51 0.1 negative manual P 307 15.5733 130 -0.15 98
IV.FEMA.HNE. 2021-12-06T09:52:34.84 0.3 undecidable manual P 274 15.4734 130 0.19 73
IV.GUMA.HHZ. 2021-12-06T09:52:34.55 3.0 negative manual P -0.3 0
IV.MC2.EHZ. 2021-12-06T09:52:33.92 0.1 undecidable manual P 223 6.0939 157 0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MC2.EHN. ML:2.3 0.0019199999999999998 0.18 AML other m 2021-12-06T09:52:36.87
IV.MC2.EHE. ML:1.9 0.000829 0.62 AML other m 2021-12-06T09:52:37.32
IV.FDMO.HHE. ML:1.1 0.00008785000000000001 0.68 AML other m 2021-12-06T09:52:37.57
IV.GUMA.HHE. ML:1.6 0.000287 0.2 AML other m 2021-12-06T09:52:37.83
IV.GUMA.HHN. ML:1.8 0.000503 0.14 AML other m 2021-12-06T09:52:37.84
IV.GUMA.HNE. ML:1.8 0.000479 1.5 AML other m 2021-12-06T09:52:38.82
IV.NRCA.HHN. ML:1.8 0.000407 0.16 AML other m 2021-12-06T09:52:38.23
IV.FDMO.HHN. ML:1.3 0.00013800000000000002 1.32 AML other m 2021-12-06T09:52:38.82
IV.NRCA.HHE. ML:1.7 0.000338 0.92 AML other m 2021-12-06T09:52:38.28
IV.GUMA.HNN. ML:1.8 0.00043100000000000007 1.04 AML other m 2021-12-06T09:52:47.58
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