In response to concern about the spread of novel coronavirus, Stanford on Thursday announced temporary crowd-control measures at all of its on-campus sports facilities.

In an online statement, the university wrote:

“Stanford Athletics has worked closely with Stanford Environmental Health & Safety to establish attendance guidelines for each competition venue in order to allow fans the opportunity for social distancing. Public attendance will be limited to approximately 1/3 of each venue’s capacity through April 15 or until further notice.”

There are no known cases of any Stanford student or faculty member having been diagnosed with coronavirus.

The adjusted capacity for Maples Pavilion — where the Cardinal play basketball — was listed at 2,345. The Cardinal (25-5) women are ranked seventh in the country heading into the Pac-12 tournament in Las Vegas and will almost certainly host first-round games at Maples when the NCAA Tournament begins March 20-21.

Maples’ capacity for a basketball game is 7,233 and in the statement the university wrote: “Information regarding NCAA Women’s Basketball Tournament games will be communicated (at gostanford.com), on our women’s basketball social media accounts, and via email when it becomes available.”

The two NCAA tourney games the Cardinal played at Maples last season attracted 3,456 and 2,450 people, respectively.

Anyone who has already purchased a ticket for baseball or softball games or the upcoming Pac-12 wrestling tournament are exempted from the restrictions.

“All other competitions during this time period are not ticketed, and attendance will be first-come, first-served,” the statement read. “A limited portion of the reduced capacity will be reserved for student-athlete guests and Stanford students.”

The other affected facilities, their sport and the adjusted capacity are as follows:

• Avery Aquatic Center (women’s water polo): 840

• Beach Volleyball Stadium (beach volleyball): 333

• Burnham Pavilion (men’s volleyball): 475

• Cagan Stadium (women’s lacrosse): 667

• Cobb Track and Angell Field (track and field): 715

• Maples Pavilion (wrestling, men’s volleyball, men’s gymnastics): 2,195

• Smith Family Stadium (softball): 333

• Sunken Diamond (baseball): 1,000

• Taube Family Tennis Center (men’s and women’s tennis): 825

Michael Lerseth is a San Francisco Chronicle assistant sports editor. Email: mlerseth@sfchronicle.com Twitter @MikeLerseth