Earthquake with magnitude of ML 2.1 on date 13-09-2021 and time 14:23:40 (UTC) in region 4 km SE Monterosso Grana (CN)

A magnitude ML 2.1 earthquake occured in region: 4 km SE Monterosso Grana (CN), on

  • 13-09-2021 14:23:40 (UTC)
  • 13-09-2021 16:23:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.376, 7.353 at 9 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
Valgrana CN 4 786 786
Monterosso Grana CN 4 505 1291
Valloriate CN 5 109 1400
Rittana CN 5 109 1509
Gaiola CN 6 582 2091
Moiola CN 7 234 2325
Bernezzo CN 7 4104 6429
Montemale di Cuneo CN 7 241 6670
Pradleves CN 7 250 6920
Caraglio CN 8 6836 13756
Roccasparvera CN 8 741 14497
Demonte CN 8 2003 16500
Cervasca CN 9 5013 21513
Vignolo CN 10 2600 24113
Dronero CN 10 7035 31148
Roccabruna CN 11 1585 32733
Valdieri CN 11 935 33668
Castelmagno CN 12 66 33734
Borgo San Dalmazzo CN 12 12468 46202
Villar San Costanzo CN 12 1547 47749
Roccavione CN 12 2761 50510
Cartignano CN 12 190 50700
Aisone CN 13 248 50948
Roaschia CN 14 107 51055
San Damiano Macra CN 15 430 51485
Entracque CN 15 774 52259
Robilante CN 16 2306 54565
Cuneo CN 16 56081 110646
Vinadio CN 16 644 111290
Boves CN 17 9835 121125
Celle di Macra CN 18 100 121225
Busca CN 18 10181 131406
Valmala CN 19 52 131458
Macra CN 20 59 131517
Rossana CN 20 908 132425

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km W of Cuneo (56081 inhabitants)
71 Km NW of Sanremo (54807 inhabitants)
74 Km SW of Moncalieri (57294 inhabitants)
82 Km SW of Torino (890529 inhabitants)
89 Km SW of Asti (76202 inhabitants)
90 Km W of Savona (61345 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 2021-09-13
14:23:40
44.3762 7.3532 9 2021-09-13
14:38:47
Sala Sismica INGV-Roma 95387631
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-13 14:23:40 ± 0.12
Latitude 44.3762 ± 0.0099
Longitude 7.3532 ± 0.0176
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95387631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1610
Semi-minor axis of confidence ellipse (meter) 396
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 235
Circular confidence region, given by single value of horizontal uncertainty (meter) 1610
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 120
Number of associated phases, regardless of their use for origin computation 41
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.86605
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 16
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 42
Type of magnitude ML
Reference to an origin 95387631
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-13 14:38:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SENA.HHZ. 2021-09-13T14:25:36.43 3.0 undecidable manual Sn 1.73 0
IV.CSNT.HHZ. 2021-09-13T14:25:10.21 3.0 undecidable manual Sn 6.03 0
IV.TST01.HHZ. 2021-09-13T14:25:09.81 3.0 negative manual Pn 3.75 0
IV.BAG8.EHZ. 2021-09-13T14:25:00.05 3.0 undecidable manual Sn 4.63 0
IV.SAP2.EHZ. 2021-09-13T14:24:55.16 3.0 negative manual Pn 5.9 0
IV.CRTC.HHZ. 2021-09-13T14:24:45.64 3.0 negative manual Pn 3.73 0
IV.PE3.EHZ. 2021-09-13T14:24:42.08 3.0 negative manual Pn 3.75 0
IV.RIBO.EHZ.01 2021-09-13T14:24:34.49 3.0 undecidable manual Pg 6.21 0
IV.VOBA.EHZ. 2021-09-13T14:24:28.25 3.0 negative manual Pg 6.55 0
GU.POPM.HHZ. 2021-09-13T14:24:22.95 3.0 undecidable manual Pn 2.5 0
RD.ORIF.BHZ. 2021-09-13T14:24:19.22 3.0 undecidable manual S -0.72 0
IT.GNV.HGZ. 2021-09-13T14:24:18.80 3.0 undecidable manual S -0.04 0
GU.PCP.HHZ. 2021-09-13T14:24:09.31 1.0 undecidable manual S 79 0.866 50 0.08 22
MN.BNI.HHZ. 2021-09-13T14:24:07.95 3.0 undecidable manual S -1.62 0
GU.GORR.HHZ. 2021-09-13T14:24:06.41 3.0 undecidable manual P 0.6 0
RD.ORIF.BHZ. 2021-09-13T14:24:03.68 3.0 positive manual P 0.99 0
GU.RRL.HHZ. 2021-09-13T14:24:03.20 0.6 undecidable manual S 324 0.6754 50 -0.38 42
GU.LSD.HHZ. 2021-09-13T14:24:01.69 3.0 negative manual P 0.3 0
GU.RORO.HHZ. 2021-09-13T14:24:00.19 0.6 undecidable manual S 117 0.5747 50 -0.4 43
GU.ROTM.HHZ. 2021-09-13T14:23:58.29 0.6 undecidable manual P 56 0.8535 50 1.33 27
IV.MONC.HHZ. 2021-09-13T14:23:57.42 0.6 undecidable manual P 30 0.8076 50 1.25 29
GU.PCP.HHZ. 2021-09-13T14:23:57.67 0.3 undecidable manual P 79 0.866 50 0.49 59
MN.BNI.HHZ. 2021-09-13T14:23:57.15 3.0 positive manual P 0.29 0
GU.RSP.HHZ. 2021-09-13T14:23:55.20 3.0 undecidable manual P -0.59 0
IV.QLNO.HHZ. 2021-09-13T14:23:54.69 0.3 undecidable manual P 94 0.7114 50 0.17 66
GU.BURY.HHZ. 2021-09-13T14:23:53.52 0.1 undecidable manual P 166 0.6115 50 0.71 77
GU.RRL.HHZ. 2021-09-13T14:23:53.83 0.3 undecidable manual P 324 0.6754 50 -0.09 67
GU.GBOS.HHZ. 2021-09-13T14:23:53.60 0.3 undecidable manual S 111 0.3732 50 -1.01 53
GU.CANO.HHZ. 2021-09-13T14:23:53.55 0.1 undecidable manual P 105 0.6547 50 0 92
GU.RORO.HHZ. 2021-09-13T14:23:52.05 0.3 undecidable manual P 117 0.5747 50 -0.14 68
GU.IMI.HHZ. 2021-09-13T14:23:52.80 0.1 undecidable manual P 140 0.6052 50 0.09 91
GU.MGRO.HHZ. 2021-09-13T14:23:50.22 0.1 undecidable manual P 135 0.4658 50 -0.12 93
FR.SAOF.HHZ.00 2021-09-13T14:23:49.66 0.1 undecidable manual P 160 0.4155 50 0.2 93
GU.PZZ.HHZ. 2021-09-13T14:23:49.28 0.3 undecidable manual S 308 0.214 112 -0.29 71
GU.BHB.HHZ. 2021-09-13T14:23:49.93 0.1 negative manual P 352 0.4632 50 -0.36 89
GU.GBOS.HHZ. 2021-09-13T14:23:48.42 0.1 negative manual P 111 0.3732 50 -0.32 91
GU.ENR.HHZ. 2021-09-13T14:23:47.11 0.3 undecidable manual S 162 0.1538 119 -0.37 70
GU.STV.HHZ. 2021-09-13T14:23:46.56 0.3 undecidable manual S 188 0.1322 123 -0.21 73
GU.PZZ.HHZ. 2021-09-13T14:23:45.84 0.1 negative manual P 308 0.214 112 0.01 100
GU.STV.HHZ. 2021-09-13T14:23:44.57 0.1 undecidable manual P 188 0.1322 123 0.36 94
GU.ENR.HHZ. 2021-09-13T14:23:44.71 0.3 undecidable manual P 162 0.1538 119 0.09 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.STV.HHE. ML:1.9 0.000862 0.54 AML other m 2021-09-13T14:23:46.64
GU.STV.HHN. ML:1.7 0.000502 1.02 AML other m 2021-09-13T14:23:49.27
GU.PZZ.HHN. ML:2.4 0.001705 0.3 AML other m 2021-09-13T14:23:49.90
GU.PZZ.HHE. ML:2.2 0.000947 1.04 AML other m 2021-09-13T14:23:50.07
GU.BURY.HHN. ML:2 0.0001745 0.3 AML other m 2021-09-13T14:23:53.76
GU.GBOS.HHE. ML:2.4 0.0009075 0.14 AML other m 2021-09-13T14:23:53.93
GU.GBOS.HHN. ML:2.6 0.001255 0.16 AML other m 2021-09-13T14:23:53.94
GU.BHB.HNE. ML:2.2 0.0003575 1.54 AML other m 2021-09-13T14:23:57.21
GU.BHB.HHE. ML:2.2 0.000397 1.52 AML other m 2021-09-13T14:23:57.21
GU.BHB.HNN. ML:2.3 0.000511 0.56 AML other m 2021-09-13T14:23:57.62
GU.BHB.HHN. ML:2.3 0.000493 0.58 AML other m 2021-09-13T14:23:57.61
FR.SAOF.HHE.00 ML:1.9 0.00024 0.36 AML other m 2021-09-13T14:23:58.82
GU.MGRO.HHE. ML:2 0.000233 1.04 AML other m 2021-09-13T14:23:58.27
FR.SAOF.HHN.00 ML:1.9 0.0002375 1 AML other m 2021-09-13T14:23:59.98
GU.MGRO.HHN. ML:2 0.000235 0.42 AML other m 2021-09-13T14:24:00.57
GU.BURY.HNE. ML:2 0.0001855 0.88 AML other m 2021-09-13T14:24:03.46
GU.RRL.HHN. ML:2.2 0.0002155 0.18 AML other m 2021-09-13T14:24:03.83
GU.IMI.HHE. ML:2.1 0.0002405 0.08 AML other m 2021-09-13T14:24:03.95
GU.RRL.HHE. ML:2.2 0.00025 1.72 AML other m 2021-09-13T14:24:04.13
GU.IMI.HHN. ML:2 0.000179 0.86 AML other m 2021-09-13T14:24:04.18
GU.CANO.HHN. ML:2.5 0.0004645 0.22 AML other m 2021-09-13T14:24:06.26
IV.QLNO.HHN. ML:2.1 0.0001865 0.16 AML other m 2021-09-13T14:24:06.25
GU.RSP.HHN. ML:1.9 9.615E-5 0.54 AML other m 2021-09-13T14:24:06.43
IV.QLNO.HHE. ML:2.3 0.0002625 0.86 AML other m 2021-09-13T14:24:06.73
GU.CANO.HHE. ML:2.4 0.0004085 1 AML other m 2021-09-13T14:24:08.12
MN.BNI.HHE. ML:1.9 9.265E-5 0.5 AML other m 2021-09-13T14:24:08.23
MN.BNI.HHN. ML:1.6 4.85E-5 0.64 AML other m 2021-09-13T14:24:08.78
MN.BNI.HNE. ML:2 0.0001091 1.14 AML other m 2021-09-13T14:24:08.22
GU.BURY.HNN. ML:2 0.000195 0.6 AML other m 2021-09-13T14:24:09.27
GU.BURY.HHE. ML:2 0.0001755 0.2 AML other m 2021-09-13T14:24:09.28
GU.RSP.HHE. ML:1.9 9.955E-5 0.42 AML other m 2021-09-13T14:24:09.67
IV.MONC.HHE. ML:2.6 0.000443 0.16 AML other m 2021-09-13T14:24:10.55
IV.MONC.HHN. ML:2.6 0.000492 0.56 AML other m 2021-09-13T14:24:10.59
MN.BNI.HNN. ML:1.7 5.41E-5 1.22 AML other m 2021-09-13T14:24:10.31
GU.ROTM.HHN. ML:2.8 0.0007745 0.52 AML other m 2021-09-13T14:24:11.61
GU.PCP.HHE. ML:2.2 0.000175 1.8 AML other m 2021-09-13T14:24:12.02
GU.ROTM.HHE. ML:2.6 0.0004565 1.32 AML other m 2021-09-13T14:24:12.70
GU.PCP.HHN. ML:2.2 0.0001795 1.6 AML other m 2021-09-13T14:24:13.87
GU.LSD.HHN. ML:2 7.115E-5 0.34 AML other m 2021-09-13T14:24:17.62
RD.ORIF.BHN. ML:2 5.86E-5 1.64 AML other m 2021-09-13T14:24:19.92
GU.LSD.HHE. ML:2.1 9.485E-5 0.22 AML other m 2021-09-13T14:24:20.86
RD.ORIF.BHE. ML:2 6.38E-5 0.44 AML other m 2021-09-13T14:24:25.96
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