Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 30-09-2021 and time 15:55:22 (UTC) in region 4 km SW Bolognola (MC)

A magnitude ML 0.8 earthquake occured in region: 4 km SW Bolognola (MC), on

  • 30-09-2021 15:55:22 (UTC)
  • 30-09-2021 17:55:22 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9680, 13.1930 at 10 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 4 142 142
Ussita MC 5 444 586
Acquacanina MC 7 121 707
Fiastra MC 8 559 1266
Castelsantangelo sul Nera MC 9 281 1547
Visso MC 9 1107 2654
Fiordimonte MC 11 202 2856
Sarnano MC 12 3264 6120
Montefortino FM 12 1178 7298
Montemonaco AP 13 604 7902
Amandola FM 13 3629 11531
Pievebovigliana MC 14 866 12397
Pieve Torina MC 14 1458 13855
Monte Cavallo MC 16 145 14000
Preci PG 16 724 14724
Gualdo MC 16 815 15539
Cessapalombo MC 17 512 16051
Muccia MC 18 915 16966
Montegallo AP 18 523 17489
Comunanza AP 18 3166 20655
San Ginesio MC 19 3498 24153
Camporotondo di Fiastrone MC 19 563 24716
Caldarola MC 19 1823 26539

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km E of Foligno (57155 inhabitants)
54 Km NW of Teramo (54892 inhabitants)
64 Km NE of Terni (111501 inhabitants)
67 Km E of Perugia (166134 inhabitants)
71 Km N of L'Aquila (69753 inhabitants)
77 Km SW of Ancona (100861 inhabitants)
93 Km NW of Montesilvano (53738 inhabitants)
98 Km S of Fano (60888 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 0.8 2021-09-30
15:55:22		 42.9683 13.1932 11 2022-03-30
13:04:12		 Bollettino Sismico Italiano INGV 96725211
Reviewed
Rev100 		ML 0.8 2021-09-30
15:55:22		 42.97 13.1882 10 2021-09-30
16:06:01		 Sala Sismica INGV-Roma 96073891
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-30 15:55:22 ± 0.05
Latitude 42.9683 ± 0.0027
Longitude 13.1932 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96725211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 350
Semi-minor axis of confidence ellipse (meter) 283
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 214
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 16
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.21764
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 96725211
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-18 12:40:55

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96073891
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-30 16:06:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CR.ZAG.BHZ. 2021-09-30T15:56:51.04 3.0 undecidable manual Sg 4.61 0
AC.VLO.HHZ. 2021-09-30T15:56:37.55 3.0 undecidable manual Sn 0.55 0
MN.TRI.HHZ. 2021-09-30T15:56:36.71 3.0 undecidable manual Sn -9.49 0
IV.CSNT.HHZ. 2021-09-30T15:56:35.29 3.0 undecidable manual Sg 4.5 0
IV.CAPR.HNZ. 2021-09-30T15:56:28.95 3.0 negative manual Pg 11.22 0
IV.CAFI.HHZ. 2021-09-30T15:56:24.07 3.0 undecidable manual Sg 5.6 0
IV.EUCT.HNZ. 2021-09-30T15:56:20.46 3.0 positive manual Pn 0.32 0
IV.VOBA.EHZ. 2021-09-30T15:56:19.22 3.0 negative manual Pg 5.41 0
IV.SARZ.HHZ. 2021-09-30T15:56:18.06 3.0 negative manual Pn -1.45 0
IV.CRJA.HHZ. 2021-09-30T15:56:11.26 3.0 undecidable manual Pg 5.27 0
IV.ATFO.HHZ. 2021-09-30T15:56:08.60 3.0 undecidable manual Sg -1.2 0
MN.TRI.HHZ. 2021-09-30T15:56:08.92 3.0 undecidable manual Pg 10.57 0
IV.CELB.HHZ. 2021-09-30T15:56:06.45 3.0 positive manual Pg 9.56 0
GU.GSCL.HHZ. 2021-09-30T15:55:54.52 3.0 undecidable manual Pn -7.27 0
IV.BDI.HHZ. 2021-09-30T15:55:51.09 3.0 negative manual Pn -8.54 0
IV.BRSN.EHZ. 2021-09-30T15:55:51.63 3.0 positive manual Pg 1.88 0
IV.ATFO.HHZ. 2021-09-30T15:55:42.63 3.0 positive manual Pg 4.73 0
IV.SPS2.HHZ. 2021-09-30T15:55:40.30 3.0 undecidable manual Pn -2.41 0
IV.MF5.EHZ. 2021-09-30T15:55:30.46 0.3 undecidable manual S 84 21.7671 116 0.08 74
IV.MML1.EHZ. 2021-09-30T15:55:30.93 0.3 undecidable manual S 312 24.1536 50 -0.12 73
IV.CESI.HHZ. 2021-09-30T15:55:30.98 0.3 undecidable manual S 280 23.754 50 0.03 74
IV.NRCA.HHZ. 2021-09-30T15:55:28.56 0.1 undecidable manual S 203 16.2726 123 -0.17 97
IV.RMP.HHZ. 2021-09-30T15:55:28.71 3.0 positive manual P -1.83 0
IV.MML1.EHZ. 2021-09-30T15:55:27.02 0.3 undecidable manual P 312 24.1536 50 -0.21 71
IV.MMO1.EHZ. 2021-09-30T15:55:27.60 0.3 undecidable manual S 125 13.2756 128 -0.28 71
IV.CESI.HHZ. 2021-09-30T15:55:27.28 0.1 positive manual P 280 23.754 50 0.11 97
IV.FDMO.HHZ. 2021-09-30T15:55:27.21 0.3 undecidable manual S 311 11.4774 132 -0.18 73
IV.CSP1.EHZ. 2021-09-30T15:55:27.91 0.3 undecidable manual S 4 13.6752 127 -0.09 74
IV.MC2.EHZ. 2021-09-30T15:55:26.41 0.3 undecidable manual S 183 6.2937 149 0.16 74
IV.MF5.EHZ. 2021-09-30T15:55:26.92 0.3 undecidable manual P 84 21.7671 116 0.08 73
IV.FDMO.HHZ. 2021-09-30T15:55:25.35 0.1 undecidable manual P 311 11.4774 132 0.23 97
IV.CSP1.EHZ. 2021-09-30T15:55:25.52 0.1 undecidable manual P 4 13.6752 127 0.05 100
IV.MMO1.EHZ. 2021-09-30T15:55:25.35 0.3 undecidable manual P 125 13.2756 128 -0.05 75
IV.NRCA.HHZ. 2021-09-30T15:55:25.83 0.1 undecidable manual P 203 16.2726 123 -0.06 99
IV.MC2.EHZ. 2021-09-30T15:55:24.77 0.1 undecidable manual P 183 6.2937 149 0.31 96
IV.TST01.HHZ. 2021-09-30T15:55:08.36 3.0 undecidable manual P -3.02 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:0.7 0.000057004895 1.2416 AML other m 2021-09-30T15:55:27.71
IV.FDMO.HHN. ML:0.9 0.00009519146000000001 0.1408 AML other m 2021-09-30T15:55:27.56
IV.CSP1.EHN. ML:1.0 0.00009143047 0.3968 AML other m 2021-09-30T15:55:28.10
IV.CSP1.EHE. ML:1.0 0.000110561715 2.368 AML other m 2021-09-30T15:55:27.64
IV.MML1.EHN. ML:0.7 0.0000316152 0.4096 AML other m 2021-09-30T15:55:31.44
IV.MML1.EHE. ML:0.8 0.000038549545000000004 0.8832 AML other m 2021-09-30T15:55:31.44
IV.CESI.HHN. ML:0.9 0.00004253857 2.5472 AML other m 2021-09-30T15:55:31.39
IV.CESI.HHE. ML:0.8 0.000034339035 2.6624 AML other m 2021-09-30T15:55:30.11
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