Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 21-08-2011 and time 20:58:46 (Italy) in region 1 km SW San Gregorio Magno (SA)

A magnitude ML 2.0 earthquake occured in region: 1 km SW San Gregorio Magno (SA), on

  • 21-08-2011 18:58:46 (UTC)
  • 21-08-2011 20:58:46 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.6540, 15.3940 at 7 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
San Gregorio Magno SA 1 4286 4286
Buccino SA 3 5047 9333
Romagnano al Monte SA 5 368 9701
Ricigliano SA 8 1144 10845
Palomonte SA 9 3985 14830
Salvitelle SA 9 560 15390
Balvano PZ 10 1830 17220
Auletta SA 11 2336 19556
Vietri di Potenza PZ 11 2832 22388
Colliano SA 12 3638 26026
Contursi Terme SA 13 3394 29420
Sicignano degli Alburni SA 13 3519 32939
Caggiano SA 13 2765 35704
Pertosa SA 13 690 36394
Muro Lucano PZ 14 5497 41891
Petina SA 14 1159 43050
Oliveto Citra SA 14 3802 46852
Valva SA 14 1643 48495
Castelgrande PZ 15 943 49438
Savoia di Lucania PZ 16 1127 50565
Laviano SA 16 1438 52003
Bella PZ 17 5171 57174
Postiglione SA 17 2151 59325
Baragiano PZ 17 2671 61996
Polla SA 18 5279 67275
Santomenna SA 18 443 67718
Sant'Angelo Le Fratte PZ 18 1429 69147
Senerchia AV 19 842 69989
Serre SA 19 3995 73984
Castelnuovo di Conza SA 19 619 74603

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km W of Potenza (67122 inhabitants)
35 Km E of Battipaglia (50786 inhabitants)
54 Km E of Salerno (135261 inhabitants)
58 Km SE of Avellino (54857 inhabitants)
58 Km E of Cava de' Tirreni (53659 inhabitants)
74 Km E of Scafati (50787 inhabitants)
74 Km SE of Benevento (60091 inhabitants)
77 Km E of Castellammare di Stabia (66466 inhabitants)
80 Km SW of Cerignola (58396 inhabitants)
88 Km E of Torre del Greco (86275 inhabitants)
90 Km E of Portici (55274 inhabitants)
90 Km E of Ercolano (53709 inhabitants)
91 Km S of Foggia (151991 inhabitants)
92 Km E of Acerra (59573 inhabitants)
96 Km E of Afragola (65057 inhabitants)
97 Km E of Casoria (77642 inhabitants)
98 Km E of Napoli (974074 inhabitants)
99 Km SW of Andria (100440 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 		Md 2.7
ML 2.0 		2011-08-21
18:58:46		 40.654 15.394 7 2014-10-21
12:27:13		 Bollettino Sismico Italiano INGV 1275509
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2011-08-21 18:58:46 ± 0.1
Latitude 40.6540 ± 0.0045
Longitude 15.3940 ± 0.0095
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 1275509

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 595
Semi-minor axis of confidence ellipse (meter) 488
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 264
Circular confidence region, given by single value of horizontal uncertainty (meter) 943.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 99
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.48
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.13045
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 1275509
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-06 01:12:07

Md:2.7

Field Value
Value 2.7
Uncertainty 0.2
Num. used stations
Type of magnitude Md
Reference to an origin 1275509
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-06 01:12:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SCHR.EHE. 2011-08-21T18:59:12.18 10.0 undecidable manual Sg 0 0 0
IV.BSSO.HHZ. 2011-08-21T18:59:08.28 10.0 undecidable manual Pg 0 0 0
IV.SGG.HHZ. 2011-08-21T18:59:07.94 10.0 undecidable manual Pg 0 0 0
IV.PTRJ.HHN. 2011-08-21T18:59:07.75 10.0 undecidable manual Pg 0 0 0
IV.SGRT.HHZ. 2011-08-21T18:59:07.74 0.3 undecidable manual Pg 13 125.4744 0.139 81
IV.SCHR.EHE. 2011-08-21T18:59:04.71 10.0 undecidable manual Pg 0 0 0
IV.MOCO.HHE. 2011-08-21T18:59:03.92 10.0 undecidable manual Pg 0 0 0
IV.ACER.HHE. 2011-08-21T18:59:02.67 0.3 undecidable manual Sg 72 48.4182 0.094 96
IV.PAOL.HHZ. 2011-08-21T18:59:01.43 0.6 undecidable manual Pg 301 80.9523 0.687 51
IV.MRVN.HHZ. 2011-08-21T18:59:01.15 0.6 undecidable manual Pg 56 80.9523 0.404 56
IV.CAFE.HHZ. 2011-08-21T18:59:01.77 0.3 undecidable manual Sg 342 43.5231 0.505 88
MN.CUC.HHN. 2011-08-21T18:59:00.52 0.6 undecidable manual Pg 154 81.4518 -0.296 58
IV.VULT.HHZ. 2011-08-21T18:59:00.46 0.3 undecidable manual Sg 29 38.2284 0.606 86
IV.SLCN.HHZ. 2011-08-21T18:58:59.79 0.3 undecidable manual Sg 145 35.5422 0.831 78
IV.CMPR.HHZ. 2011-08-21T18:58:59.42 0.3 undecidable manual Sg 192 38.0286 -0.391 92
IV.SNAL.HHZ. 2011-08-21T18:58:58.72 0.3 undecidable manual Sg 333 33.8439 0.343 93
IV.SIRI.HHZ. 2011-08-21T18:58:57.90 0.3 undecidable manual Pg 142 65.8896 -0.52 85
IV.SGTA.HHZ. 2011-08-21T18:58:56.17 0.3 undecidable manual Pg 357 53.4021 -0.317 90
IV.MTSN.HHN. 2011-08-21T18:58:56.35 0.3 undecidable manual Pg 145 52.6029 -0.011 97
IV.MCEL.HHN. 2011-08-21T18:58:56.26 0.3 undecidable manual Pg 137 50.2164 0.26 92
IV.MGR.HHN. 2011-08-21T18:58:56.87 0.3 undecidable manual Pg 167 58.8966 -0.469 87
IV.ACER.HHE. 2011-08-21T18:58:55.81 0.3 undecidable manual Pg 72 48.4182 0.089 96
IV.MCRV.HHZ. 2011-08-21T18:58:55.34 0.3 undecidable manual Sg 307 23.754 0.375 94
IV.CAFE.HHZ. 2011-08-21T18:58:54.38 0.3 undecidable manual Pg 342 43.5231 -0.584 85
IV.VULT.HHZ. 2011-08-21T18:58:54.53 0.3 undecidable manual Pg 29 38.2284 0.38 92
IV.CDRU.HHZ. 2011-08-21T18:58:54.44 0.3 undecidable manual Sg 202 19.7691 0.768 82
IV.CMPR.HHZ. 2011-08-21T18:58:53.70 0.3 undecidable manual Pg 192 38.0286 -0.424 91
IV.SLCN.HHZ. 2011-08-21T18:58:53.57 0.3 undecidable manual Pg 145 35.5422 -0.063 98
IV.SNAL.HHZ. 2011-08-21T18:58:52.65 0.3 undecidable manual Pg 333 33.8439 -0.649 84
IV.MRLC.HHZ. 2011-08-21T18:58:51.41 0.3 undecidable manual Sg 35 13.875 -0.389 94
IV.CDRU.HHZ. 2011-08-21T18:58:50.68 0.3 undecidable manual Pg 202 19.7691 0.1 100
IV.MCRV.HHZ. 2011-08-21T18:58:50.82 0.3 undecidable manual Pg 307 23.754 -0.51 91
IV.MRLC.HHZ. 2011-08-21T18:58:49.09 0.3 undecidable manual Pg 35 13.875 -0.404 94
IV.CPGN.EHZ. 2011-08-21T18:58:39.52 10.0 undecidable manual Pg 0 0 0
IV.MTGR.SHZ. 2011-08-21T18:58:25.04 10.0 undecidable manual Pg 0 0 0
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
Waveforms Seismic signals in miniseed + resp format Download