Earthquake with magnitude of ML 2.0 on date 11-09-2020 and time 10:21:08 (UTC) in region 3 km E Tassarolo (AL)

A magnitude ML 2.0 earthquake occured in region: 3 km E Tassarolo (AL), on

  • 11-09-2020 10:21:08 (UTC)
  • 11-09-2020 12:21:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.72, 8.81 at 26 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Tassarolo AL 3 672 672
Gavi AL 3 4614 5286
Serravalle Scrivia AL 4 6128 11414
Stazzano AL 5 2486 13900
Novi Ligure AL 5 28154 42054
San Cristoforo AL 5 608 42662
Pasturana AL 6 1318 43980
Francavilla Bisio AL 6 531 44511
Parodi Ligure AL 7 715 45226
Vignole Borbera AL 7 2182 47408
Carrosio AL 7 510 47918
Cassano Spinola AL 7 1731 49649
Arquata Scrivia AL 7 6409 56058
Bosio AL 8 1227 57285
Montaldeo AL 8 265 57550
Pozzolo Formigaro AL 9 4775 62325
Sardigliano AL 9 406 62731
Castelletto d'Orba AL 9 2047 64778
Gavazzana AL 9 180 64958
Capriata d'Orba AL 9 1904 66862
Mornese AL 10 737 67599
Basaluzzo AL 10 2087 69686
Casaleggio Boiro AL 11 372 70058
Borghetto di Borbera AL 11 1966 72024
Voltaggio AL 11 738 72762
Silvano d'Orba AL 11 1988 74750
Sant'Agata Fossili AL 12 425 75175
Villalvernia AL 12 955 76130
Lerma AL 12 869 76999
Fresonara AL 12 731 77730
Carezzano AL 12 431 78161
Predosa AL 12 2048 80209
Grondona AL 13 510 80719
Paderna AL 13 220 80939
Castellania AL 13 90 81029
Rocca Grimalda AL 14 1512 82541
Tagliolo Monferrato AL 14 1581 84122
Isola del Cantone GE 14 1540 85662
Spineto Scrivia AL 14 337 85999
Costa Vescovato AL 15 335 86334
Fraconalto AL 15 336 86670
Ovada AL 16 11477 98147
Belforte Monferrato AL 16 515 98662
Carbonara Scrivia AL 16 1122 99784
Bosco Marengo AL 16 2457 102241
Avolasca AL 16 294 102535
Villaromagnano AL 16 715 103250
Carpeneto AL 17 977 104227
Garbagna AL 17 696 104923
Ronco Scrivia GE 17 4417 109340
Frugarolo AL 17 1968 111308
Cerreto Grue AL 17 323 111631
Montaldo Bormida AL 18 664 112295
Montegioco AL 18 313 112608
Roccaforte Ligure AL 18 136 112744
Trisobbio AL 19 655 113399
Cantalupo Ligure AL 19 527 113926
Sarezzano AL 19 1171 115097
Rocchetta Ligure AL 19 200 115297
Molare AL 20 2181 117478
Cremolino AL 20 1086 118564
Casal Cermelli AL 20 1234 119798
Orsara Bormida AL 20 424 120222
Busalla GE 20 5563 125785
Casasco AL 20 129 125914
Dernice AL 20 185 126099

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km SE of Alessandria (93943 inhabitants)
36 Km N of Genova (586655 inhabitants)
52 Km E of Asti (76202 inhabitants)
52 Km NE of Savona (61345 inhabitants)
59 Km SW of Pavia (72576 inhabitants)
67 Km S of Vigevano (63310 inhabitants)
79 Km W of Piacenza (102191 inhabitants)
82 Km S of Novara (104380 inhabitants)
89 Km SW of Milano (1345851 inhabitants)
92 Km S of Rho (50434 inhabitants)
94 Km E of Moncalieri (57294 inhabitants)
97 Km SW of Sesto San Giovanni (81608 inhabitants)
97 Km E of Torino (890529 inhabitants)
98 Km S of Legnano (60262 inhabitants)
99 Km SW of Cinisello Balsamo (75078 inhabitants)
100 Km S of Busto Arsizio (83106 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
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
Bulletin
Rev1000
ML 2.0 2020-09-11
10:21:08
44.72 8.81 26 2021-02-26
14:55:55
Bollettino Sismico Italiano INGV 83107401
Reviewed
Rev100
ML 2.0 2020-09-11
10:21:07
44.72 8.81 27 2020-09-11
10:36:42
Sala Sismica INGV-Roma 82814571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-11 10:21:08 ± 0.15
Latitude 44.72 ± 0.01
Longitude 8.81 ± 0.01
Depth (km) 26 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83107401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 817
Semi-minor axis of confidence ellipse (meter) 755
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 159
Circular confidence region, given by single value of horizontal uncertainty (meter) 820
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.79235
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:2

Field Value
Value 2
Uncertainty 0.3
Num. used stations 19
Type of magnitude ML
Reference to an origin 83107401
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-09-21 14:39:16

ML:2

Field Value
Value 2
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 82814571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-11 10:36:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ROSPO.HHZ. 2020-09-11T10:22:40.58 3.0 undecidable manual Pg 18.16 0
IV.PE3.EHZ. 2020-09-11T10:22:29.67 3.0 undecidable manual Sn 4.54 0
IV.SGG.HHZ. 2020-09-11T10:22:24.20 3.0 undecidable manual Pn -0.63 0
IV.MOCL.EHZ. 2020-09-11T10:22:06.21 3.0 undecidable manual Sg 5.41 0
IV.MTCE.HHZ. 2020-09-11T10:22:05.75 3.0 positive manual Pn -0.81 0
IV.ARVD.HHZ. 2020-09-11T10:21:54.07 3.0 positive manual Pn -2.41 0
ST.RONC.EHZ. 2020-09-11T10:21:38.82 0.3 undecidable manual P 45 1.7923 54 0.77 39
IV.MILN.HNZ. 2020-09-11T10:21:35.57 3.0 undecidable manual S -0.35 0
IV.ZCCA.HHZ. 2020-09-11T10:21:33.89 3.0 positive manual Pn -0.23 0
GU.CIRO.HHZ. 2020-09-11T10:21:29.47 0.6 undecidable manual P 316 1.242 54 -0.97 31
GU.ENR.HHZ. 2020-09-11T10:21:28.81 0.6 undecidable manual P 244 1.1053 98 0.28 41
GU.TRAV.HHZ. 2020-09-11T10:21:28.08 0.3 undecidable manual P 317 1.0909 98 -0.21 63
GU.ROTM.HHZ. 2020-09-11T10:21:22.41 0.3 undecidable manual S 292 0.3489 118 0.52 68
GU.GORR.HHZ. 2020-09-11T10:21:22.08 0.3 undecidable manual S 108 0.3615 117 -0.17 73
GU.RNCA.HHZ. 2020-09-11T10:21:20.20 0.3 undecidable manual S 158 0.2671 126 0.35 74
IT.GNV.HGE. 2020-09-11T10:21:20.88 0.3 undecidable manual S 163 0.3004 123 0.23 75
GU.PCP.HHZ. 2020-09-11T10:21:19.39 0.3 undecidable manual S 227 0.2581 127 -0.23 73
IV.QLNO.HHE. 2020-09-11T10:21:18.25 0.3 undecidable manual P 220 0.5135 109 -0.39 67
IV.SARZ.HHZ. 2020-09-11T10:21:17.53 0.3 undecidable manual S 27 0.1664 141 -0.14 78
IV.BOB.HHE. 2020-09-11T10:21:17.88 0.3 undecidable manual P 84 0.4569 111 0.15 73
GU.GORR.HHZ. 2020-09-11T10:21:16.15 0.1 undecidable manual P 108 0.3615 117 -0.1 99
GU.ROTM.HHZ. 2020-09-11T10:21:16.45 0.1 undecidable manual P 292 0.3489 118 0.41 94
IT.GNV.HGE. 2020-09-11T10:21:15.53 0.1 undecidable manual P 163 0.3004 123 0.21 100
GU.PCP.HHZ. 2020-09-11T10:21:14.53 0.1 positive manual P 227 0.2581 127 -0.2 99
GU.RNCA.HHZ. 2020-09-11T10:21:14.75 0.1 undecidable manual P 158 0.2671 126 -0.11 100
IV.ACQ.HGZ. 2020-09-11T10:21:14.26 3.0 undecidable manual P 0
IV.SARZ.HHZ. 2020-09-11T10:21:13.08 0.3 undecidable manual P 27 0.1664 141 -0.52 71
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SARZ.HHN. ML:0 0.00123 0.24 AML other m 2020-09-11T10:21:18.12
IV.SARZ.HNN. ML:0 0.00121 0.26 AML other m 2020-09-11T10:21:18.25
GU.PCP.HHE. ML:1.7 0.0001891004 0.3584 AML other m 2020-09-11T10:21:19.60
GU.PCP.HHN. ML:1.6 0.0001444259 0.2432 AML other m 2020-09-11T10:21:19.76
IV.SARZ.HHE. ML:0 0.0008965 0.26 AML other m 2020-09-11T10:21:20.87
IV.SARZ.HNE. ML:0 0.000864 0.24 AML other m 2020-09-11T10:21:20.87
GU.RNCA.HHN. ML:0 0.0002657078 0.2176 AML other m 2020-09-11T10:21:21.61
GU.RNCA.HHE. ML:0 0.0003025 0.24 AML other m 2020-09-11T10:21:21.08
GU.GORR.HHE. ML:1.8 0.00019144405 0.2816 AML other m 2020-09-11T10:21:22.40
GU.ROTM.HHN. ML:2.3 0.00060009625 0.48 AML other m 2020-09-11T10:21:23.63
GU.GORR.HHN. ML:1.7 0.00013664365 0.4032 AML other m 2020-09-11T10:21:26.01
GU.ROTM.HHE. ML:2.1 0.0003645396 0.3008 AML other m 2020-09-11T10:21:29.97
IV.ZCCA.HNE. ML:2.6 0.0001384901 0.6592 AML other m 2020-09-11T10:21:37.77
GU.TRAV.HHE. ML:2 7.4192005E-5 0.1984 AML other m 2020-09-11T10:21:44.39
GU.TRAV.HHN. ML:2 7.471214E-5 1.8016 AML other m 2020-09-11T10:21:45.10
GU.ENR.HHN. ML:1.7 3.301493E-5 0.3584 AML other m 2020-09-11T10:21:47.35
GU.ENR.HHE. ML:1.6 2.4445735E-5 0.1216 AML other m 2020-09-11T10:21:47.70
GU.CIRO.HHN. ML:1.9 4.4371565E-5 0.2368 AML other m 2020-09-11T10:21:48.63
GU.CIRO.HHE. ML:1.5 2.212272E-5 0.096 AML other m 2020-09-11T10:21:49.40
IV.ARVD.HHN. ML:2.1 1.14475075E-5 0.0576 AML other m 2020-09-11T10:21:59.57
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