Earthquake with magnitude of ML 2.1 on date 26-10-2021 and time 06:42:16 (Italy) in region 1 km S Castello d'Argile (BO)

A magnitude ML 2.1 earthquake occured in region: 1 km S Castello d'Argile (BO), on

  • 26-10-2021 04:42:16 (UTC)
  • 26-10-2021 06:42:16 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.674, 11.299 at 26 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
Castello d'Argile BO 1 6550 6550
Pieve di Cento BO 5 7019 13569
Sala Bolognese BO 5 8353 21922
Argelato BO 5 9844 31766
Cento FE 6 35686 67452
San Giorgio di Piano BO 7 8512 75964
San Pietro in Casale BO 9 12202 88166
San Giovanni in Persiceto BO 10 27982 116148
Bentivoglio BO 10 5469 121617
Castel Maggiore BO 12 18231 139848
Calderara di Reno BO 12 13196 153044
Sant'Agata Bolognese BO 13 7291 160335
Crevalcore BO 13 13465 173800
Galliera BO 14 5439 179239
Sant'Agostino FE 15 6853 186092
Minerbio BO 16 8793 194885
Anzola dell'Emilia BO 16 12267 207152
Ravarino MO 17 6233 213385
Finale Emilia MO 18 15699 229084
Granarolo dell'Emilia BO 18 11910 240994
Poggio Renatico FE 18 9852 250846
Camposanto MO 18 3201 254047
Baricella BO 19 6951 260998
Malalbergo BO 19 8943 269941

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km N of Bologna (386663 inhabitants)
30 Km E of Modena (184973 inhabitants)
31 Km SW of Ferrara (133155 inhabitants)
35 Km E of Carpi (70699 inhabitants)
49 Km NW of Imola (69797 inhabitants)
53 Km E of Reggio nell'Emilia (171345 inhabitants)
59 Km SW of Rovigo (51867 inhabitants)
63 Km NW of Faenza (58541 inhabitants)
77 Km W of Ravenna (159116 inhabitants)
77 Km NW of Forlì (117913 inhabitants)
78 Km E of Parma (192836 inhabitants)
88 Km NE of Pistoia (90315 inhabitants)
88 Km S of Verona (258765 inhabitants)
90 Km N of Prato (191150 inhabitants)
93 Km SW of Padova (210401 inhabitants)
96 Km NW of Cesena (96758 inhabitants)
99 Km S of Vicenza (112953 inhabitants)
Recent and historical seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map reports the earthquake epicenters located in the 72 hours (3 days) preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located in the 90 days preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version https://emidius.mi.ingv.it/CPTI15-DBMI15/) with estimated magnitude ≥ 5.0 since 1000 AD until 2014. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
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 2.1 2021-10-26
04:42:16
44.6743 11.2993 26 2021-10-26
04:55:06
Sala Sismica INGV-Roma 96994131
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-26 04:42:16 ± 0.32
Latitude 44.6743 ± 0.0135
Longitude 11.2993 ± 0.0228
Depth (km) 26 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96994131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1822
Semi-minor axis of confidence ellipse (meter) 1446
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 280
Circular confidence region, given by single value of horizontal uncertainty (meter) 1820
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 282
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.61158
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 13
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.1
Num. used stations 14
Type of magnitude ML
Reference to an origin 96994131
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-26 04:55:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RMP.HHZ. 2021-10-26T04:43:57.42 3.0 undecidable manual Sg 9.32 0
IX.NSC3.EHZ.02 2021-10-26T04:43:50.33 3.0 undecidable manual Pg 17.48 0
IV.PAOL.HHZ. 2021-10-26T04:43:41.79 3.0 undecidable manual Pg 14.3 0
IV.VAGA.HHZ. 2021-10-26T04:43:32.11 3.0 positive manual Pg 10.92 0
ST.ZIAN.EHZ. 2021-10-26T04:43:04.80 0.1 undecidable manual S 6 1.6116 54 0.79 55
SI.LUSI.HHZ. 2021-10-26T04:42:56.70 0.1 undecidable manual S 349 1.3085 54 -0.05 79
IV.SFI.EHZ. 2021-10-26T04:42:55.25 3.0 undecidable manual S -0.1 0
IV.MAGA.HHZ. 2021-10-26T04:42:54.30 0.1 undecidable manual S 337 1.197 54 0.21 78
ST.DOSS.HHZ. 2021-10-26T04:42:53.90 0.1 undecidable manual S 356 1.2078 54 -0.46 74
IV.SALO.HHZ. 2021-10-26T04:42:52.00 0.1 undecidable manual S 330 1.09 98 0.65 72
ST.VARA.EHZ. 2021-10-26T04:42:52.90 0.1 undecidable manual S 346 1.1853 54 -0.91 62
IV.MBAL.EHZ. 2021-10-26T04:42:50.40 0.1 undecidable manual S 343 1.0684 98 -0.31 78
OX.MARN.HHZ. 2021-10-26T04:42:47.60 0.1 undecidable manual S 356 0.965 99 -0.08 84
ST.ZIAN.EHZ. 2021-10-26T04:42:44.23 0.1 undecidable manual P 6 1.6116 54 0.38 63
IV.TEOL.HHZ. 2021-10-26T04:42:40.70 0.1 undecidable manual S 21 0.7365 102 -0.31 83
SI.LUSI.HHZ. 2021-10-26T04:42:40.06 0.6 positive manual P 349 1.3085 54 0.4 37
IV.FIR.HHZ. 2021-10-26T04:42:39.08 3.0 undecidable manual P 0.08 0
IV.BAG8.HNZ. 2021-10-26T04:42:38.53 0.1 undecidable manual P 333 1.2887 54 -0.86 62
IV.BRSN.EHZ. 2021-10-26T04:42:38.13 3.0 positive manual P 1.05 0
ST.DOSS.HHZ. 2021-10-26T04:42:38.46 1.0 negative manual P 356 1.2078 54 0.18 20
IV.MAGA.HHZ. 2021-10-26T04:42:38.17 0.6 positive manual P 337 1.197 54 0.04 40
ST.VARA.EHZ. 2021-10-26T04:42:37.62 0.6 positive manual P 346 1.1853 54 -0.34 38
IV.SALO.HHZ. 2021-10-26T04:42:37.18 1.0 negative manual P 330 1.09 98 0.64 18
IV.MBAL.EHZ. 2021-10-26T04:42:36.77 0.6 positive manual P 343 1.0684 98 0.59 37
IV.ROVR.HHZ. 2021-10-26T04:42:35.00 1.0 undecidable manual P 351 0.9848 99 0.24 21
OX.MARN.HHZ. 2021-10-26T04:42:35.00 0.1 undecidable manual P 356 0.965 99 0.58 77
IV.ZEN8.EHZ. 2021-10-26T04:42:35.96 0.6 negative manual P 338 1.0423 98 0.22 41
GU.GSCL.HHZ. 2021-10-26T04:42:30.19 3.0 negative manual P -0.36 0
IV.TEOL.HHZ. 2021-10-26T04:42:30.89 0.6 undecidable manual P 21 0.7365 102 0.32 43
IV.RAVA.EHZ. 2021-10-26T04:42:25.20 0.1 undecidable manual S 303 0.152 143 -0.4 93
IV.RAVA.EHZ. 2021-10-26T04:42:21.63 0.1 negative manual P 303 0.152 143 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RAVA.EHE. ML:3 0.00504 0.24 AML other m 2021-10-26T04:42:25.31
IV.CAVE.HHN. ML:2.4 0.000836 0.14 AML other m 2021-10-26T04:42:25.41
IV.CAVE.HHE. ML:2.4 0.000929 0.7 AML other m 2021-10-26T04:42:25.38
IV.RAVA.EHN. ML:2.8 0.002905 0.78 AML other m 2021-10-26T04:42:25.74
IV.BAG8.HNE. ML:3.1 0.000672 1.5 AML other m 2021-10-26T04:42:42.17
IV.BAG8.EHE. ML:3 0.000629 0.22 AML other m 2021-10-26T04:42:42.82
IV.TEOL.HHN. ML:2.1 0.000149 0.28 AML other m 2021-10-26T04:42:43.76
IV.TEOL.HHE. ML:2.1 0.0001565 0.94 AML other m 2021-10-26T04:42:44.59
IV.BRSN.EHE. ML:2.2 0.0002425 0.66 AML other m 2021-10-26T04:42:45.41
OX.MARN.HHN. ML:2.2 0.0001365 0.34 AML other m 2021-10-26T04:42:48.08
OX.MARN.HHE. ML:2.1 0.0001021 0.6 AML other m 2021-10-26T04:42:48.49
IV.MBAL.EHE. ML:2.2 0.00013 0.94 AML other m 2021-10-26T04:42:52.65
IV.MBAL.EHN. ML:2.2 0.0001255 0.1 AML other m 2021-10-26T04:42:52.31
IV.SALO.HHE. ML:2 6.295E-5 0.76 AML other m 2021-10-26T04:42:52.20
IV.SGAL.EHE. ML:2 6.035E-5 0.48 AML other m 2021-10-26T04:42:53.37
IV.SALO.HHN. ML:2.1 8.96E-5 0.62 AML other m 2021-10-26T04:42:53.06
IV.SGAL.EHN. ML:2 7.73E-5 0.24 AML other m 2021-10-26T04:42:53.58
IV.MAGA.HHE. ML:2.5 0.0001965 1.64 AML other m 2021-10-26T04:42:55.82
IV.MAGA.HHN. ML:2.5 0.000209 0.22 AML other m 2021-10-26T04:42:55.09
ST.DOSS.HHE. ML:1.9 4.995E-5 0.28 AML other m 2021-10-26T04:42:55.53
IV.BRSN.EHN. ML:2.3 0.000284 1.4 AML other m 2021-10-26T04:42:56.04
IV.ZEN8.EHN. ML:2.2 0.0001295 0.06 AML other m 2021-10-26T04:42:57.48
SI.LUSI.HHE. ML:2.1 5.79E-5 1.5 AML other m 2021-10-26T04:42:57.87
SI.LUSI.HHN. ML:2.3 9.45E-5 0.16 AML other m 2021-10-26T04:42:57.88
IV.ZEN8.EHE. ML:1.9 6.725E-5 1.56 AML other m 2021-10-26T04:42:58.86
ST.DOSS.HHN. ML:1.8 4.06E-5 0.3 AML other m 2021-10-26T04:42:59.13
IV.BAG8.EHN. ML:3.3 0.001009 1.66 AML other m 2021-10-26T04:43:04.13
IV.BAG8.HNN. ML:3.2 0.0009855 1.68 AML other m 2021-10-26T04:43:04.96
IV.FIR.HHN. ML:2.6 0.0003585 0.08 AML other m 2021-10-26T04:43:19.43
IV.FIR.HNN. ML:2.6 0.000427 0.92 AML other m 2021-10-26T04:43:19.43
IV.FIR.HHE. ML:2.9 0.000744 0.24 AML other m 2021-10-26T04:43:20.18
IV.FIR.HNE. ML:2.8 0.000677 0.32 AML other m 2021-10-26T04:43:20.19
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://terremoti.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download