Earthquake with magnitude of ML 1.7 on date 30-09-2021 and time 10:40:37 (Italy) in region 3 km NE Grizzana Morandi (BO)

A magnitude ML 1.7 earthquake occured in region: 3 km NE Grizzana Morandi (BO), on

  • 30-09-2021 08:40:37 (UTC)
  • 30-09-2021 10:40:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.28, 11.176 at 11 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
Grizzana Morandi BO 3 3916 3916
Vergato BO 5 7639 11555
Marzabotto BO 7 6779 18334
Monzuno BO 8 6328 24662
San Benedetto Val di Sambro BO 8 4315 28977
Loiano BO 12 4294 33271
Monghidoro BO 13 3749 37020
Castel d'Aiano BO 14 1906 38926
Sasso Marconi BO 14 14735 53661
Camugnano BO 14 1885 55546
Castiglione dei Pepoli BO 15 5648 61194
Zocca MO 16 4719 65913
Castel di Casio BO 17 3448 69361
Pianoro BO 18 17460 86821
Montese MO 19 3353 90174
Monterenzio BO 19 6035 96209
Monte San Pietro BO 20 10982 107191

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km SW of Bologna (386663 inhabitants)
44 Km NE of Pistoia (90315 inhabitants)
44 Km W of Imola (69797 inhabitants)
45 Km N of Prato (191150 inhabitants)
45 Km SE of Modena (184973 inhabitants)
56 Km W of Faenza (58541 inhabitants)
57 Km N of Firenze (382808 inhabitants)
58 Km N of Scandicci (50609 inhabitants)
61 Km SE of Carpi (70699 inhabitants)
64 Km SE of Reggio nell'Emilia (171345 inhabitants)
69 Km W of Forlì (117913 inhabitants)
71 Km SW of Ferrara (133155 inhabitants)
72 Km NE of Lucca (89046 inhabitants)
83 Km W of Ravenna (159116 inhabitants)
87 Km W of Cesena (96758 inhabitants)
87 Km E of Massa (69479 inhabitants)
87 Km NE of Viareggio (62467 inhabitants)
88 Km NE of Pisa (89158 inhabitants)
89 Km SE of Parma (192836 inhabitants)
89 Km E of Carrara (63133 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 1.7 2021-09-30
08:40:37
44.2798 11.1758 11 2021-09-30
08:51:30
Sala Sismica INGV-Roma 96055911
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-30 08:40:37 ± 0.12
Latitude 44.2798 ± 0.0072
Longitude 11.1758 ± 0.0100
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96055911

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 832
Semi-minor axis of confidence ellipse (meter) 755
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 18
Circular confidence region, given by single value of horizontal uncertainty (meter) 830
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.11781
Epicentral distance of station farthest from the epicenter (degree) 0.47754
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 96055911
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-30 08:51:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.POPM.HHZ. 2021-09-30T08:40:51.74 0.6 undecidable manual S 232 0.3813 50 0.22 46
IV.MOCL.EHZ. 2021-09-30T08:40:48.39 0.3 undecidable manual S 179 0.2752 50 0.03 74
IV.SEI.HHZ. 2021-09-30T08:40:47.75 0.3 undecidable manual S 150 0.2608 50 -0.2 71
IV.RAVA.EHE. 2021-09-30T08:40:47.44 1.0 undecidable manual P 355 0.4775 50 0.12 23
IV.VISG.HHZ. 2021-09-30T08:40:46.32 0.6 undecidable manual S 116 0.2059 50 -0.01 50
GU.POPM.HHZ. 2021-09-30T08:40:45.53 0.6 negative manual P 232 0.3813 50 -0.14 47
IV.ZCCA.HNZ. 2021-09-30T08:40:44.85 0.3 undecidable manual S 297 0.1592 121 -0.02 76
IV.SEI.HHZ. 2021-09-30T08:40:43.60 0.1 positive manual P 150 0.2608 50 -0.01 99
IV.FNVD.HHZ. 2021-09-30T08:40:43.96 0.6 undecidable manual S 199 0.1178 129 0.38 47
IV.MOCL.EHZ. 2021-09-30T08:40:43.93 0.1 undecidable manual P 179 0.2752 50 0.08 97
IV.MTRZ.HNZ. 2021-09-30T08:40:43.44 0.6 undecidable manual P 79 0.1808 50 1.19 34
IV.VISG.HHZ. 2021-09-30T08:40:42.36 0.1 undecidable manual P 116 0.2059 50 -0.32 94
IV.ZCCA.HNZ. 2021-09-30T08:40:41.68 0.1 undecidable manual P 297 0.1592 121 -0.16 98
IV.FNVD.HHZ. 2021-09-30T08:40:40.99 0.1 undecidable manual P 199 0.1178 129 -0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FNVD.HHE. ML:1.6 0.000431 1.92 AML other m 2021-09-30T08:40:44.03
IV.FNVD.HHN. ML:1.6 0.0004305 1.78 AML other m 2021-09-30T08:40:44.08
IV.VISG.HHN. ML:0.9 4.93E-5 0.8 AML other m 2021-09-30T08:40:46.85
IV.VISG.HHE. ML:0.7 3.635E-5 1.66 AML other m 2021-09-30T08:40:47.16
IV.SEI.HHE. ML:1.6 0.0002205 0.46 AML other m 2021-09-30T08:40:48.95
IV.SEI.HHN. ML:1.8 0.00035 1.68 AML other m 2021-09-30T08:40:49.05
IV.MOCL.EHN. ML:1.6 0.0001675 0.24 AML other m 2021-09-30T08:40:50.17
IV.MOCL.EHE. ML:1.4 0.00011615 0.32 AML other m 2021-09-30T08:40:50.27
GU.POPM.HHE. ML:1.7 0.0001725 0.34 AML other m 2021-09-30T08:40:52.22
GU.POPM.HHN. ML:1.7 0.0001745 0.18 AML other m 2021-09-30T08:40:52.48
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